Signs of protein deficiency, which refers to the symptoms of hypoproteinemia, can be characterized by limb weakness, low immunity, body swelling, and anemia. Protein is one of the three main nutrients that make up the human body and comes in a wide variety. Different protein deficiencies can manifest in different ways. When hemoglobin is deficient, the body will show signs of anemia such as pale skin and pale eyelids. Deficiency of plasma proteins means the occurrence of hypoproteinemia, which leads to the flow of plasma fluid out of the tissues, gathering in the interstitial space of the tissues, resulting in the body to appear puffy, usually double lower extremity swelling, eyelid swelling, and so on. Protein deficiency and low immunity are prone to colds as well as other infectious diseases, etc. It is also not conducive to recovery from illness. If you suspect protein deficiency, you should go to the hospital for examination, and follow the doctor’s instructions for standardized treatment after a clear diagnosis.