The clinical symptoms of zinc deficiency in men are usually of the following four categories: 1. The most obvious manifestations of digestive system diseases are nausea, vomiting, abdominal distension, abdominal pain, heartburn, acid reflux, etc. In severe cases, there are also clinical manifestations of nutritional and digestive malabsorption, often accompanied by abdominal distension and constipation. 2. Zinc deficiency can lead to endocrine disorders and aggravate the clinical symptoms of the nervous system, such as insomnia, anxiety, irritability, and irritability. 4.