The best way to fight a cold is with plenty of rest and fluids, but doctors admit that medication can make the worst symptoms more bearable. But it's important to know that no drug will actually lessen the length or severity of your cold; it can only treat the symptoms.
If the pain in the buttocks is more noticeable when sitting it may be caused by tightness in the hamstring. Proximal hamstring tendonopathy and high hamstring tendonitis is defined as inflammation originating in the hamstring, causing pain in the lower buttocks, or pelvic bone region.
Piriformis syndrome causes pain in the buttock which may radiate down the leg. It is due to the sciatic nerve being impinged by a tight piriformis muscle deep in the buttocks. Treatment involves reducing the painful symptoms then rehabilitating the muscle with strengthening and stretching exercises.