Hi,
Well this as a whole depends upon the college you are in. I would suggest you to talk to the HOd and dean of your college. Also talk to the repsective faculty.
Take along the medical certificate of the hospital you took treatment in. As this is an internal exam you can get helo from you college faculty.
All the best

Yes I think if you are absent in internals then it will affect your marks you will be allowed for the semester don't worry fir that just talk to respective teachers and HOD

You just have to inform your respective coordinator or HOD. they will ask for medical. submit it. you can give your first semester exam easily. 

thanks

Dear Harish

Not an issue Harish , if you didn't given your internal exam then you must inform to your respective Dean or the department hod such that they will manage your internal marks with your second internal and afterwards you didn't face any difficulties. But yaah you should consult with your department HOD as soon as possible regarding your health issue.

All the best