Hello there... Yes, knee pain is painful and uncomfortable. It is one of the common ailment that affects everyone. It can be caused by injuries, sports and other activities. It may also be the result of medical conditions like infections gout and arthritis. I would like to suggest you not to rest too much, do some exercise that is safe for your knees like walking, swimming which can strengthen the muscles that support your knee and increase flexibility and its best to consult nearby Physiotherapist for proper investigation so that proper diagnostic can be started. Thanks!