Severe knee pain for many days may be due to joint inflammation, strain, or an underlying condition that needs proper care. Rest your knees, avoid heavy activity, and use a warm compress to reduce stiffness and pain, and try gentle movement as tolerated. Maintain a healthy weight and avoid sitting or standing in one position for long. As the pain has been ongoing and is severe, it is important to get examined so the cause can be identified and treated properly.

Severe pain in the right arm with difficulty moving may be due to muscle injury, nerve irritation, or a joint problem, and requires proper attention. Rest the arm, avoid any heavy use, and apply a cold compress for the first day or two to reduce pain, then a warm compress to relax the muscles. Keep the arm supported and avoid sudden movements. As you are unable to move it properly, it is important to consult a doctor to identify the exact cause and start appropriate treatment.

Severe body pain can result from viral infections, fever, muscle strain, vitamin deficiencies, stress, poor sleep, arthritis, dehydration, nerve-related problems, or inflammatory conditions. Some people feel generalised heaviness, weakness, stiffness, or burning pain throughout the body, especially during infection, exhaustion, or nutritional imbalance. The exact cause of the disease often depends on associated symptoms such as fever, swelling, fatigue, numbness or joint pain. Relief usually depends on identifying the underlying cause of the pain. Sufficient hydration, proper sleep, gentle stretching, warm compresses, and balanced nutrition may help in milder cases. Doctors may sometimes recommend blood tests for vitamin D, calcium, thyroid function, infection markers, or anaemia if the pain persists for many days. Pain-relieving medicines or physiotherapy may help depending on whether the problem is muscular, inflammatory, or nerve-related. High fever, chest pain, breathing difficulty, sudden weakness, severe swelling, or inability to walk should be checked urgently because widespread body pain can occasionally signal a more serious medical condition.