Symptoms of kidney essence deficiency include developmental delay, low fertility and premature aging. 1. Developmental delay: Kidney essence deficiency may lead to growth retardation, low intelligence, delayed closure of fontanel, short stature, slow movement and weak bones in children. 2. Low fertility function: Kidney essence deficiency may lead to weakening of fertility function in adults, with women having less menstruation or amenorrhea, or even being unable to get pregnant, and men having less spermatozoa and infertility. 3. Premature aging: Kidney essence deficiency may also lead to premature aging in adults, with symptoms such as lumbar and knee weakness (a feeling of soreness and weakness in the waist and knees), hair loss, wobbly teeth, deafness and tinnitus, forgetfulness and dementia, and foot weakness. If related symptoms occur, it is recommended to visit the hospital for early and regular treatment.