I usually feel a sharp pain inside my right breast. the appearance looks normal,no lump or discharge. but painful when i touched it. what's this pls?

Very common but...: Most breast pain is benign and related to hormonal changes/menstrual cycle. If at other times, it could represent a breast cyst or benign growth called a fibroadenoma. Typically, these are treated with tylenol (acetaminophen) or NSADs such as ibuprofen and resolves. It is much less common to have pain symptoms with breast cancer; however, if no relief in a couple weeks, a mammogram or ultrasound is rec.