Severe knee pain without injury, along with thyroid issues and low vitamin D, can be related, as both can cause joint pain and weakness. Low vitamin D, especially, can lead to bone and muscle discomfort, and thyroid imbalance can also affect joints. She should rest the knee, avoid straining, use a warm compress to ease pain, and perform gentle movement as tolerated. It is important to correct vitamin D levels and keep thyroid under control, so a doctor can guide proper treatment to improve her symptoms.

Pain in the elbow after a workout is usually due to muscle strain or overuse of the joint. Rest the arm, avoid heavy lifting for a few days, and apply a cold compress on the first day or two to reduce pain, then a warm compress to relax the muscles. Gentle stretching can help once the pain starts easing. If the pain is severe, does not improve, or keeps coming back, it is better to consult your doctor.