A knee that has twisted and is painful while standing is most often due to a soft-tissue injury, such as a ligament strain or a knee sprain, and the first step is simple care: rest the knee, avoid putting too much weight on it, apply ice for 10-15 minutes several times a day, keep the leg elevated, and use a compression bandage if comfortable. You can take a mild pain reliever if needed. Do not try heavy activity or force movement until the pain improves. If the pain is severe, swelling increases, you cannot bear weight, or it does not improve within a few days, consult a doctor as you may need an examination or imaging to rule out ligament or cartilage injury.

Mild pain on one side of the scrotum can be due to several common causes, such as minor strain or injury, inflammation or infection like epididymitis, fluid collection (hydrocele), or a small swelling of veins (varicocele), and sometimes it may even be temporary without a clear cause. Usually, rest, wearing supportive underwear, and avoiding heavy activity can help if the pain is mild and recent. However, it is important to monitor your symptoms and seek medical care promptly if the pain becomes severe or sudden, if there is swelling, redness, fever, a lump, or nausea/vomiting, as this could indicate a more serious condition, such as testicular torsion, which requires urgent treatment. If the discomfort persists for a few days, a doctor's examination (and possibly an ultrasound) is recommended to confirm the cause.