Joint pain is an uncomfortable condition which occurs due to irritation, soreness or uneasiness in the joints (point where two bones assemble). It arises when the ligaments or tendons in joints undergo some infection, inflammation or injury. Sometimes it can be mild and temporary but at times it becomes severe and hence needs a thorough treatment. The most common cause of joint pain is arthritis (including osteoarthritis, rheumatoid arthritis, septic arthritis, psoriatic arthritis and gout). Sprains and strains (due to injury) may also lead to join pain. It can also crop up in diseases like hypothyroidism and fibromyalgia. Some serious illnesses like lupus (an autoimmune disease), bone cancer and leukemia lead to joint pain as well.