Three more and one less refers to polydipsia, polyuria, polyphagia, and weight loss. It is a typical clinical manifestation of diabetic patients. It is due to the lack of insulin in the body, and blood sugar cannot be fully converted into energy. Due to high blood sugar, a large amount of osmotic diuresis occurs, resulting in polyuria. After polyuria, plasma osmotic pressure will increase, which will bring mouth Thirsty, drink a lot. Due to the loss of a large amount of sugar, and at the same time blood sugar cannot be converted into energy, obvious fatigue and hunger will lead to weight loss, and some people will also have obvious hyperthyroidism.
三多一少指多饮、多尿、多食、体重下降。是糖尿病患者典型的临床表现，是由于体内胰岛素缺乏，血糖不能够充分变成能量，由于血糖高带来大量的渗透利尿，出现多尿，多尿以后会出现血浆渗透压增高，会带来口渴、多饮。由于糖大量丢失，同时血糖不能变成能量，明显的乏力、饥饿感，这样会出现体重下降，有些人还会出现明显的食欲亢进。
