Needs to be checked : The pain in knee at age of 20 is usually due to trauma causing damage to cartilages or ligaments . Some time you may not remember if there was any trauma.It may be due to running,exercise etc.You should get it checked by your doctor and will need History and Physical exam and may need imaging like X-rays and /or MRI.to find the cause and get it treated appropriately
Answered 8/11/2015
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