What things must I consider not doing when my knee hurts?

Not seeking help! Knee pain can be for many reasons, with the most common being osteoarthritis, a condition that is to many other inflammatory conditions. A smart doctor will know this & screen you for other chronic disabling diseases. See your dr! in the meantime, pain is nature's splint. It is telling you something is wrong.Most important thing is not to make it worse. Little or weight on it, get a diagnosis!