What is the reason why the penis erection is not firm?

What is the reason why the penis erection is not firm?
The common reasons for weak penile erection can be divided into three categories: psychological, physiological, and lifestyle habits. The core is abnormal neural regulation or vascular blood supply. Attention should be paid: do not take related drugs on your own. If the symptoms persist for several weeks without improvement or are accompanied by other discomforts, seek medical examination in a timely manner.
Psychological reasons: Excessive stress, anxiety, and strained relationships with partners can interfere with the neural regulation of erection, such as excessive worry about poor performance, sympathetic nervous system stimulation that inhibits penile vasodilation and related hormone secretion; Typical symptoms: often occur in specific settings (such as in a room), with normal erections during normal times or when alone, often accompanied by psychological anxiety; Coping methods: Proactively adjust your mindset, communicate fully with your partner, let go of excessive focus on performance, and seek professional psychological guidance if necessary.
Physiological reasons: insufficient blood supply to blood vessels, fluctuation of androgen levels, chronic diseases, etc. Penile erection relies on sufficient blood flow, and vascular lesions or hormonal imbalances can directly affect erection; Typical symptoms: persistent insufficient erection hardness, which is difficult to improve even in a relaxed state, and may be accompanied by other physical discomforts; Response method: Regular physical examinations should be conducted to check for underlying diseases. If hormone abnormalities occur, adjustments can be made under the guidance of a doctor to avoid long-term fatigue or staying up late.
Lifestyle habits: Long term staying up late, smoking and drinking, lack of exercise, etc. can damage blood vessels or nerve function. For example, smoking can affect blood vessel elasticity, and drinking alcohol can interfere with nerve conduction; Typical symptoms: Daily fatigue, poor hardness during erection, mild to severe symptoms, related to daily routine and diet; Coping methods: Regular daily routine, quitting smoking and limiting alcohol consumption, engaging in moderate exercise every week, and improving overall physical condition.