Hello guys. I asked my doctor and this is what he told me.
If your knees and feet are hot, red, and swollen, it could be a sign of various conditions or illnesses (besides some of you already mentioned). Some possible causes include:
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Arthritis: Both rheumatoid arthritis and osteoarthritis can cause joint inflammation and swelling, which can lead to hot, red, and swollen knees and feet.
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Gout: Gout is a type of arthritis caused by a buildup of uric acid crystals in the joints. It commonly affects the big toe, but can also cause hot, red, and swollen knees and feet.
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Cellulitis: Cellulitis is a skin infection that can cause redness, swelling, and warmth in the affected area. If the infection affects the knees and feet, they may become hot, red, and swollen.
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Deep vein thrombosis (DVT): DVT is a blood clot that forms in a deep vein, usually in the leg. It can cause swelling, redness, and warmth in the affected leg.
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Injuries: An injury to the knee or foot, such as a sprain or fracture, can cause swelling, redness, and warmth in the affected area.
It is important to see a doctor if you are experiencing hot, red, and swollen knees and feet, especially if it is accompanied by pain, fever, or difficulty moving the affected joint.
Hope this helps.