Having a lumbar fossa is a sign of kidney deficiency. Some of the usual manifestations of kidney deficiency, such as premature aging, forgetfulness and insomnia, loss of appetite, joint pain, waist and knee weakness, intolerance of fatigue, weakness, hearing loss, hair loss and gray hair, there must be timely treatment of kidney deficiency, regardless of any disease, the most fear is to delay the time, because this can easily lead to deterioration, or even make the condition more serious. Men are prone to reduced libido, impotence, weakness, seminal emission, slippery sperm, premature ejaculation, etc.