Disease symptoms are evidences of presence of diseases. Symptoms are in the form of structural and functional changes in he body or body parts.They indicate that there is something wrong in the body e.g. wound with pus, oedema, cough, cold, loose motions, pain in abdomen, headache, fever. However symptoms do not give any exact cause of the disease. For instance, headache may be due to some dozen different diseases. There may be problem of eye sight, blood pressure, some sort of stress(such as of examination, meanigitis, pollution, etc).