There are more reasons for gallbladder polyps to change from 5mm to 1cm in three years, which are mainly related to malignant changes, environmental factors, long-term consumption of high-fat food, and heavy drinking. 1. Malignant changes: when the gallbladder is subjected to malignant stimulation for a long period of time, the gallbladder polyps will become larger. 2. Environmental factors: such as excessive stress, emotional instability, frequent staying up late, drinking alcohol, irregular work and rest, etc., will make the gallbladder polyps bigger. 3. Eating high-fat food or drinking too much alcohol for a long time can also cause gallbladder polyps to enlarge. There may be other reasons for the enlargement of gallbladder polyps, such as genetic mutation, long-term medication, bile secretion abnormalities, etc. When the growth of gallbladder polyps is more than 1cm, it is recommended to consult a doctor in time, and perform surgical resection if necessary.