To determine whether gray hair is caused by blood heat or kidney deficiency, the main thing is to observe the accompanying symptoms of gray hair. Blood heat is mainly characterized by thirst, body heat, irritability, etc. Kidney deficiency is manifested by lumbar and knee soreness (a feeling of soreness and weakness of the waist and knees), hair loss, mental lethargy, and so on. Chinese medicine believes that hair is the residue of blood, after blood heat may lead to gray hair, accompanied by thirst, body heat at night, heartburn, insomnia, irritability, and even spotty rashes, etc. It is necessary to cool the blood and clear the heat and take Wuha Pills, which are not suitable for patients with colds and flu. Chinese medicine believes that the manifestation of kidney outside is hair, and kidney deficiency may lead to gray hair, accompanied by dizziness, tinnitus, hair loss, deafness, lumbar and knee soreness, and poor mental health, etc., you can take TIANMA SHOUWU tablets, and caution should be taken for those who have dampness-heat inside, and phlegm-fire congestion. Taking the above medicines should be guided by a doctor.