Anemia is a clinical syndrome that occurs when the volume of red blood cells in the peripheral blood is lower than normal. After anemia in men, the common symptoms are: i. Neurological symptoms. They include dizziness, fatigue, headache, insomnia, dreaminess, memory loss, inattention, etc. Sometimes there are also changes in the mental faculties. Second, skin and mucous membrane changes. Patients show pale skin and mucous membrane and shortened nail bed filling time. In case of hemolytic anemia, yellow staining of the skin and sclera may occur. Third, the symptoms of respiratory and circulatory system. Patients show panic and chest tightness, especially after light activity, the symptoms of panic and chest tightness will be significantly increased. Digestive system changes. Due to the atrophy of digestive glands caused by anemia, the patient will experience reduced digestive function, abdominal distension and loss of appetite. V. Changes in the genitourinary system. Due to long-term anemia, men will experience a decrease in androgen concentration and their male characteristics will be weakened.