The causes of unclear display of the tail of the pancreas can be indigestion, physiological hypoplasia of the pancreas or pancreatitis. 1. Dyspepsia: Since the pancreas is in the retroperitoneum and is blocked by the stomach and intestines, when the patient suffers from dyspepsia, a lot of gases in the stomach and intestines are not discharged in time. And the gas interferes with ultrasonography more obviously, which may lead to the tail of the pancreas not being seen on ultrasound, suggesting that the tail of the pancreas is not well displayed. 2. Physiological hypoplasia of the pancreas: in the case of elderly patients, the normal physiological function of the pancreas may decline or even the tail of the pancreas may atrophy and become small in size, resulting in poor visualization during the relevant examination. 3. Pancreatitis: when the patient suffers from pancreatitis, due to the lesion of the tail of the pancreas, imbalance of pancreatic secretion, pancreatic fluid blockage, etc., it may lead to the unclear display of the tail of the pancreas during the examination. When the tail of the pancreas is not clear, it is recommended that the patient consult a doctor in a timely manner and follow the doctor’s instructions to do further examination to clarify the cause of the disease, which will be conducive to treatment and recovery.