Iron deficiency in the body does not usually lead to shivering; shivering may be due to other reasons, while iron deficiency may show symptoms such as brittle nails, anemia, mental and behavioral abnormalities. There are more reasons for body shivering, and it is recommended to rule out disease factors, such as muscle, joint, and nerve disorders. Patients with iron deficiency may experience soreness or weakness in the muscles and joints and usually do not experience shaking. 1. Brittle nails: If the patient’s body is deficient in iron, it will lead to thinning and brittle fingernails and toenails, which are easy to break, and the nails will also appear to be sunken or spoon-shaped. 2. Symptoms of anemia: Iron is an important component of hemoglobin, which helps transport oxygen to all parts of the body. Insufficient iron will lead to iron-deficiency anemia, which in turn induces a series of symptoms of anemia, such as fatigue, panic, dizziness and pallor. 3. Mental and behavioral abnormalities: more obvious in children, manifested as difficulty in concentration, hyperactivity and even xenophagia. It is recommended that patients go to the hospital in time to complete the relevant examinations, to clarify the cause of the disease and then follow the doctor’s instructions to avoid aggravation of the symptoms.