Many people have knee pain, it can be caused by injury or illnesses. If something inside the knee like bones, ligaments, tendons, cartilage or bursae is hurt or swollen it can cause pain. Signs of knee pain include swelling, stiffness, redness, warmth, weakness, popping or crunching sounds or locking of the knee.
Your feet and ankles have a lot of bones and joints, and many tendons, ligaments, and muscles that help them move. Your feet can show if you have other health problems like diabetes, arthritis, or heart disease. If your feet or ankle hurts, it can make it hard to move around and exercise, which can make other health problems worse.
Sciatica pain is caused by an irritation, inflammation, pinching or compression of a nerve in the lower back. The most common cause is a herniated or slipped disk that causes pressure on the nerve root. Most people with sciatica get better on their own with time and self-care treatments.