###Human: I am having quad pain when running to the point where I cannot bear any weight. ###Assistant: Hi. From the details provided, you are apparently suffering from a muscle pull or partial detachment of the tendon from the bone. Muscles are attached to the bones by a fibrous, cord-like structure called tendons. Your quadriceps (thigh muscle) need rest in order to recover. So, you may stop running till the time the affected muscles recover.