Many different conditions can lead to painful joints, including osteoarthritis, rheumatoid arthritis, bursitis, gout, strains, sprains, and other injuries. Joint pain is extremely common. Growing pains are common in children and can make their legs and feet ache at night. The pain can also be felt in the knees, thighs, and calves. It can occur on both sides of the body. Sometimes growing pains occur in the stomach and can cause headaches. It happens in episodes mostly at night off. INSTRUCTIONS: Medicines: Pain medicine: You may be given medicine to take away or decrease pain. Do not wait until the pain is severe before you take your medicine. If you have pain when you eat, take pain medicine before you start.