What is it? i have headache (better by: rest) (side: left) (worsened by: bending over, coughing or sneezing) (occured: > 3 hours) (quality: sharp or s

Could be many things: Your headache could be many things: a migraine, sinus infection, change in your diet, flu, muscle contraction, etc. It is concerning if your neck is stiff, it is severe, you have a fever, or you have other parts of your body not working right because of it. If those things are present, you need to see a doctor. If not, you can take tylenol to help relieve the pain.

Many causes for Head: Headache is a symptom of many different causes. Most often it is caused by Sinusitis(following a recent head cold)....In this case it will resolve in a few days. Recuring headaches can be due to stress(tension headaches). One sided headache raise the possibility of Migraine which is very common cause of headache. Take a couple of tylenols as needed and see if it goes away. Medical checkup advised