An application for stomach pain to class teacher is a short formal letter students write when they need leave because of stomach ache. A clear and polite application helps the teacher understand the situation quickly.
Below are simple sample formats you can edit and use.

Sample 1: One Day Leave for Stomach Pain
To,
The Class Teacher / Principal
[School Name]
Date: [Write Date]
Subject: Leave application for stomach pain
Respected Sir/Madam,
I have been suffering from stomach pain since last night. The doctor has advised me to take rest. I will not be able to attend school today. Kindly grant me leave for one day.
I shall be thankful to you.
Yours obediently,
[Your Name]
Class: [Class]
Roll No: [Number]
Sample 2: Half Day Leave
To,
The Class Teacher
[School Name]
Date: [Write Date]
Subject: Application for half day leave due to stomach pain
Respected Sir/Madam,
I am having severe stomach pain and need to go to the hospital. Kindly allow me half day leave today.
Thanking you,
Yours obediently,
[Your Name]
Roll No: [Number]
Sample 3: Leave for Two or Three Days
To,
The Principal
[School Name]
Date: [Write Date]
Subject: Leave application for stomach pain
Respected Sir/Madam,
I have been suffering from stomach pain for the last two days. The doctor has advised complete rest. Kindly grant me leave from [start date] to [end date].
Yours faithfully,
[Your Name]
Class: [Class]
Sample 4: Simple Stomach Pain Leave
To,
The Class Teacher
[School Name]
Date: [Write Date]
Subject: Application for leave due to stomach pain
Respected Sir/Madam,
I have stomach pain and will not be able to attend school today. Kindly grant me leave.
I shall remain thankful to you.
Yours obediently,
[Your Name]
These samples for an application for stomach pain to class teacher can be customized with your details.