Push Notification Service

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 6 min read
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Article Summary

A push notification service is a technology that an application uses to send messages to users. You may have seen app notifications or alerts pop up on your mobile device. Those are communication signals that came from the application server. The server, not the user, initiates the push notification exchange. Applications use push notifications to make users aware of upcoming deals, app events, or other information...

Key Takeaways

  • This article explains What are the benefits of using a push notification service? in simple medical language.
  • This article explains What are the use cases of a push notification service? in simple medical language.
  • This article explains What are the types of push notifications? in simple medical language.
  • This article explains How do push notifications work? in simple medical language.
Educational health guideWritten for patient understanding and clinical awareness.
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Emergency safety firstUrgent warning signs are highlighted below.

Seek urgent medical care if you notice

These warning signs are general safety guidance. Local emergency numbers and clinical judgment should always come first.

  • Severe symptoms, breathing difficulty, fainting, confusion, or rapidly worsening illness.
  • New weakness, severe pain, high fever, or symptoms after a serious injury.
  • Any symptom that feels urgent, unusual, or unsafe for the patient.
1

Emergency now

Use emergency care for severe, sudden, rapidly worsening, or life-threatening symptoms.

2

See a doctor

Book a professional medical evaluation if symptoms persist, worsen, recur often, affect daily activities, or occur in a high-risk patient.

3

Learn safely

Use this article to understand possible causes, tests, treatment options, prevention, and questions to ask your clinician.

A push notification service is a technology that an application uses to send messages to users. You may have seen app notifications or alerts pop up on your mobile device. Those are communication signals that came from the application server. The server, not the user, initiates the push notification exchange. Applications use push notifications to make users aware of upcoming deals, app events, or other information they might be interested in. While mobile push notifications are the most common type, there are also web push notifications, wearable push notifications, and voice push notifications.

What are the benefits of using a push notification service?

Over the past several years, push notification services have become essential to mobile apps. In 2009, Apple released the first version of its Apple Push Notification service (APNs) for iOS, which allowed app publishers to send messages to users without requiring them to open the app. Google launched its push notification service in 2012 for Android. Your users might expect push notifications as a feature, and they can help both you and your users.

Here are some benefits of using a push notification service.

Increased engagement

Push notifications are an effective way to engage your users. You can use push notifications to send your users relevant information, remind them to use your application, and prompt them to take advantage of features and promotions. Multiple studies show push notifications have higher open rates than emails, SMS messaging, and chat applications.

Improved retention

You can use push notifications to create more targeted and relevant messaging for your users. For example, you can target users based on their past behaviors, locations, interests, and other factors. This could increase customer retention and revenue.

Greater user control

Your users might prefer push notifications to other communication methods, because push notifications are easy to control as a user. Your users can opt in to receive push notifications and opt out when they want.

What are the use cases of a push notification service?

Here are some of the most common ways that organizations use push notifications.

Marketing campaigns

Push notifications are often used for marketing campaigns. Promotion details, discounts, new product launches, and other important updates are sent directly to your users’ devices.

Push notifications are an effective way to push campaigns and encourage your users to perform actions. For example, you can prompt them to download a new app, sign up for a service, or purchase products they liked.

Successful push notification campaigns also help to bring back past customers.

Transactional notifications

Push notifications can alert your users to transactions like financial activity in their accounts. For example, banks use push notifications to alert customers about deposits, withdrawals, account balance updates, and other changes to their accounts.

Push notifications help customers stay on top of their finances and be aware of any suspicious activity. You can also use push notifications to send customers payment reminders and other alerts about upcoming transactions.

One-time passwords

Push notifications can deliver one-time passwords (OTPs), which let you authenticate user accounts. For example, when a user attempts to log in or make a purchase, you can send an OTP to the user’s mobile device. The user would then enter the OTP to complete the action, so you can verify the user’s identity without storing sensitive information. More generally, OTPs are one aspect of multi-factor authentication (MFA).

Emergency alerts

Government organizations can use push notifications to deliver emergency alerts to the public. These can be alerts about natural disasters as well as other emergencies, such as Amber Alerts, terrorist threats, and extreme weather warnings.

Medical services

Push notifications can send your users health information like appointment updates, medication reminders, and test results. Additionally, push notifications can remind patients to take their medications or book follow-up appointments.

Shipping updates

As a retailer or supplier, you can send push notifications to keep your customers updated on the status of their orders. You can notify your customers of any changes in an order’s shipping status, such as when it is shipped, when it is out for delivery, and when it is delivered. Push notifications can also provide tracking numbers and estimated delivery times.

Customer feedback

Push notifications can prompt your customers to provide feedback about a product or service. You can use them to ask customers to rate their experiences or leave comments about products or services. Additionally, you can use push notifications to conduct surveys and gain insights into your customers’ preferences and opinions.

Social media

If you run a social media application, you can send push notifications to your users about updates such as new posts and comments. When you send users a notification whenever new content is available, they can quickly access and engage with the latest news without manually checking for updates.

What are the types of push notifications?

There are two main types of push notifications: application-to-person (A2P) and person-to-person (P2P).

A2P

A2P push notifications are sent from an application or service to an individual user. Some examples are news and alerts, promotional messages, and transactional messages.

P2P

P2P push notifications are sent directly from one user to another, commonly to notify the recipient of an event or activity. They include chat messages, friend requests, reminders, and location updates.

How do push notifications work?

For a push notification to happen, a publisher has to send it, a user has to receive it, and a service has to connect them. The relationship between these three parties is like this:

  • A publisher uses an application server to send notifications to its users
  • A user agrees to receive notifications by subscribing through their device
  • A platform-specific push notification service links a publisher to its users

If you’re developing a mobile app, here are common steps to consider if you want to start sending push notifications.

Register app with push notification service

You should connect with the push notification service of individual platforms that you want to target. For example, you should design your app to connect with Apple Push Notification service (APNs) to target iOS users and Firebase Cloud Messaging (FCM) to target Android users. You can register your app with the push notification service to gain access to the service API.

Process service tokens

Push notification services maintain a connection with each app and associated mobile device that have registered with their services. When an app and mobile device register, the push notification service returns a device token. As a developer, you can process and use the tokens to send notifications to your users.

Start to send notifications

Your application server sends the content of a notification and device tokens to your push notification service API. Once the server has sent the request to the push notification service, the service sends the notification to your users’ devices.

The notification appears on the devices’ lock screens, notification centers, or app icons, depending on your users’ settings. Your users can then tap the notification to go to your app or website.

Patient safety assistant

Check your symptom safely

Hi, I am RX Symptom Navigator. I can help you understand what to read next and what warning signs need care.
Warning: Do not use this in emergencies, pregnancy, severe illness, or as a substitute for a doctor. For children or teens, use with a parent/guardian and clinician.
A rural-friendly guide: warning signs, when to see a doctor, related articles, tests to discuss, and OTC safety education.
1 Symptom 2 Severity 3 Safe guidance
First safety question

Is there chest pain, breathing trouble, fainting, confusion, severe bleeding, stroke-like weakness, severe injury, or pregnancy danger sign?

Choose quickly

Browse by body area
Start here: Write or select a symptom. The guide will show warning signs, doctor guidance, diagnostic tests to discuss, OTC safety education, and related RX articles.

Important: This tool is educational only. It cannot diagnose, treat, or replace a doctor. OTC information is not a prescription. In an emergency, contact local emergency services or go to the nearest hospital.

Doctor visit helper

Prepare before seeing a doctor

A simple rural-patient checklist to help you explain symptoms clearly, ask better questions, and avoid unsafe self-treatment.

Safety note: This is not a prescription or diagnosis. For severe symptoms, pregnancy danger signs, children with serious illness, chest pain, breathing difficulty, stroke-like weakness, or major injury, seek urgent care.

Which doctor may help?

Start with a registered doctor or the nearest qualified health center.

What to tell the doctor

  • Write when the problem started and how it changed.
  • Bring old prescriptions, investigation reports, and current medicines.
  • Write allergies, pregnancy status, diabetes, kidney/liver disease, and major past illnesses.
  • Bring one family member if the patient is weak, elderly, confused, or a child.

Questions to ask

  • What is the most likely cause of my symptoms?
  • Which danger signs mean I should go to hospital quickly?
  • Which tests are necessary now, and which can wait?
  • How should I take medicines safely and what side effects should I watch for?
  • When should I come for follow-up?

Tests to discuss

  • Vital signs: temperature, pulse, blood pressure, oxygen saturation
  • Basic physical examination by a clinician
  • CBC, urine test, blood sugar, or imaging only when clinically needed

Avoid these mistakes

  • Do not use antibiotics, steroid tablets/injections, or strong painkillers without proper medical advice.
  • Do not hide pregnancy, kidney disease, ulcer, allergy, or blood thinner use.
  • Do not delay emergency care when danger signs are present.

Medicine safety and first-aid guide

This section is for patient education only. It does not replace a doctor, pharmacist, or emergency care.

Safe first steps

  • Avoid heavy lifting, sudden bending, and prolonged bed rest.
  • Use comfortable posture and gentle movement as tolerated.
  • Discuss physiotherapy, X-ray, or MRI only when clinically needed.

OTC medicine safety

  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
  • Avoid repeated painkiller use if you have kidney disease, stomach ulcer, uncontrolled blood pressure, or are taking blood thinners.

Avoid these mistakes

  • Do not start antibiotics without a proper medical decision.
  • Do not use steroid tablets or injections casually for quick relief.
  • Do not delay emergency care because of home remedies.

Get urgent help if

  • Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

For rural patients and family caregivers

Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Doctor / qualified healthcare provider
Tests to discuss with doctor
  • Basic vital signs: temperature, pulse, blood pressure, oxygen level if needed
  • Relevant blood, urine, imaging, or specialist tests only after clinical assessment
Questions to ask
  • What is the most likely cause of my symptoms?
  • Which warning signs mean I should go to emergency care?
  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Back pain care roadmap

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • New leg weakness, numbness around private area, or loss of bladder/bowel control
  • Back pain after major injury, fever, unexplained weight loss, cancer history, or severe night pain
Doctor / service to discuss: Orthopedic/spine specialist, physical medicine doctor, physiotherapist under guidance, or qualified clinician.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Discuss neurological examination first. X-ray or MRI may be needed only when red flags, injury, nerve weakness, or persistent severe symptoms are present.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.
  • Avoid forceful massage or bone-setting when there is weakness, injury, fever, or nerve symptoms.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

RX Patient Help

Ask a health question safely

Write your symptom story. A health professional or site editor can review it before any answer is prepared. This box is not for emergency care.

Emergency first: Severe chest pain, breathing trouble, unconsciousness, stroke signs, severe injury, heavy bleeding, or rapidly worsening symptoms need urgent local medical care now.

Frequently Asked Questions

What are the benefits of using a push notification service?

Over the past several years, push notification services have become essential to mobile apps. In 2009, Apple released the first version of its Apple Push Notification service (APNs) for iOS, which allowed app publishers to send messages to users without requiring them to open the app. Google launched its push notification service in 2012 for Android. Your users might expect push notifications as a feature, and they can help both you and your users. Here are some benefits of using…

Increased engagement Push notifications are an effective way to engage your users. You can use push notifications to send your users relevant information, remind them to use your application, and prompt them to take advantage of features and promotions. Multiple studies show push notifications have higher open rates than emails, SMS messaging, and chat applications. Improved retention You can use push notifications to create more targeted and relevant messaging for your users. For example, you can target users based on their past behaviors, locations, interests, and other factors. This could increase customer retention and revenue. Greater user control Your users might prefer push notifications to other communication methods, because push notifications are easy to control as a user. Your users can opt in to receive push notifications and opt out when they want.What are the use cases of a push notification service?

Here are some of the most common ways that organizations use push notifications.

Marketing campaigns Push notifications are often used for marketing campaigns. Promotion details, discounts, new product launches, and other important updates are sent directly to your users’ devices.Push notifications are an effective way to push campaigns and encourage your users to perform actions. For example, you can prompt them to download a new app, sign up for a service, or purchase products they liked.Successful push notification campaigns also help to bring back past customers. Transactional notifications Push notifications can alert your users to transactions like financial activity in their accounts. For example, banks use push notifications to alert customers about deposits, withdrawals, account balance updates, and other changes to their accounts.Push notifications help customers stay on top of their finances and be aware of any suspicious activity. You can also use push notifications to send customers payment reminders and other alerts about upcoming transactions. One-time passwords Push notifications can deliver one-time passwords (OTPs), which let you authenticate user accounts. For example, when a user attempts to log in or make a purchase, you can send an OTP to the user’s mobile device. The user would then enter the OTP to complete the action, so you can verify the user's identity without storing sensitive information. More generally, OTPs are one aspect of multi-factor authentication (MFA). Emergency alerts Government organizations can use push notifications to deliver emergency alerts to the public. These can be alerts about natural disasters as well as other emergencies, such as Amber Alerts, terrorist threats, and extreme weather warnings. Medical services Push notifications can send your users health information like appointment updates, medication reminders, and test results. Additionally, push notifications can remind patients to take their medications or book follow-up appointments. Shipping updates As a retailer or supplier, you can send push notifications to keep your customers updated on the status of their orders. You can notify your customers of any changes in an order’s shipping status, such as when it is shipped, when it is out for delivery, and when it is delivered. Push notifications can also provide tracking numbers and estimated delivery times. Customer feedback Push notifications can prompt your customers to provide feedback about a product or service. You can use them to ask customers to rate their experiences or leave comments about products or services. Additionally, you can use push notifications to conduct surveys and gain insights into your customers’ preferences and opinions. Social media If you run a social media application, you can send push notifications to your users about updates such as new posts and comments. When you send users a notification whenever new content is available, they can quickly access and engage with the latest news without manually checking for updates.What are the types of push notifications?

There are two main types of push notifications: application-to-person (A2P) and person-to-person (P2P).

A2P A2P push notifications are sent from an application or service to an individual user. Some examples are news and alerts, promotional messages, and transactional messages. P2P P2P push notifications are sent directly from one user to another, commonly to notify the recipient of an event or activity. They include chat messages, friend requests, reminders, and location updates.How do push notifications work?

For a push notification to happen, a publisher has to send it, a user has to receive it, and a service has to connect them. The relationship between these three parties is like this: A publisher uses an application server to send notifications to its users A user agrees to receive notifications by subscribing through their device A platform-specific push notification service links a publisher to its users If you’re developing a mobile app, here are common steps to consider if you want to start sending…

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