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.

Mouth pain in children for a few days may occur due to mouth ulcers, minor infection, or irritation from food. Giving soft foods and ensuring the child drinks enough fluids may help reduce discomfort. Maintaining good oral hygiene and avoiding very spicy or acidic foods can also help the area heal. Consult a doctor if the pain continues or the child has difficulty eating or drinking.

Severe body pain can occur due to viral infections, muscle strain, lack of rest, or nutritional deficiencies. Getting enough rest, staying hydrated, and eating a balanced diet may help the body recover. Gentle stretching and warm compresses can also reduce muscle discomfort. Consult a doctor if the pain is intense, lasts for several days, or is associated with fever or weakness.