High blood pressure in the morning may be caused by physiological factors such as poor living habits and emotional abnormalities, or it may be due to primary hypertension, or it may be due to sleep apnea syndrome, glomerulonephritis and other diseases. 1. Physiological factors: Usually the phenomenon of high blood pressure in the morning may be due to poor living habits, smoking, drinking and other bad habits or maintaining a high salt and low potassium diet. Long-term mental tension, anxiety and other emotions can also lead to increased blood pressure, which are normal physiological phenomena. 2. Primary hypertension: It is usually caused by the interaction of genetic and environmental factors, and also related to obesity, drugs and other factors. Patients may have high blood pressure in the morning, accompanied by headache, dizziness and other symptoms. 3. Sleep apnea syndrome: it is usually caused by the narrowing of the upper airway or the decrease of the ability to maintain the open function, and it is mostly related to factors such as obesity, family history, and abnormalities of the anatomical structure of the upper airway at multiple levels. Patients often experience symptoms such as sleep snoring, drowsiness, daytime sleepiness, etc. Some patients may also experience elevated blood pressure and cardiac arrhythmia, which may manifest as high blood pressure in the morning. 4. Glomerulonephritis: It is usually caused by infection, immune system disease, underlying chronic disease, etc. It is also related to improper diet and fatigue. Patients often appear hematuria, edema, proteinuria, hypertension and other symptoms, which can also appear in the morning high blood pressure phenomenon. Some patients may also suffer from fatigue and weight loss. It is recommended that when patients have high blood pressure in the morning, they should exclude physiological factors in time, and if it is caused by disease, they should clarify the cause of the disease for treatment.