i have light pain

Hello,
Dear customer

Regarding what you mentioned,

  as temporary measure we advise you to use a simple analgesic medication  such as paracetmol or ibuprofen tablets in order to relieve the associated pain and you have to avoid further physical exertion which may aggravate the condition.

What is the cause of this pain ?

The pain itself does not indicate a particular disease so we need to clarify the exact cause of this case then we can answer your question as soon as possible.
Stay well.
Feel free to message me anytime here if you have further questions.
It is our pleasure to help. Please feel free to reach out to me anytime.
You can also ask our other certified experts in various fields such as Nutritionists, Lawyers, IT Experts, Therapists, Mechanics, Doctors, Handymen, and more.
kind regards.