How to improve when menstrual volume is low but menstrual cycle is long

Patient's question:

On the 25th, my period started and it has been almost 20 days so far. The flow is light. What could be the reason? I would like to ask the doctor.
Medical history and treatment effectiveness:
I had a color ultrasound a week ago, and the doctor said it might be a tumor. He prescribed some anti-tumor and anti-inflammatory medication, and I have also been taking traditional Chinese medicine. However, my period has not yet ended. The pad I use has a dark red blood stain in the middle, about the size of a coin, with pinkish blood around the edges.
Help needed:
I would like to ask the doctor if it could be a tumor, or if it might be due to general endocrine imbalance?

Doctor's answer:

This is a case of menstrual irregularity, which is related to an individual's endocrine system and daily diet, lifestyle, and sleep patterns. The longer it persists, the slower the recovery.
Recommendations: The key lies in self-adjustment. Maintain a regular and orderly diet, lifestyle, and sleep schedule. Avoid smoking, alcohol, staying up late, overexertion, and exposure to cold. Adjust your mindset, avoid excessive stress, and keep your emotions stable. Engage in appropriate physical activity and exercise, develop good habits, gradually improve, and promote the return to a normal state.
If you have taken emergency contraception pills, it can cause menstrual irregularity. Additionally, if you haven't taken them, check if your period is delayed and whether pregnancy is a possibility.

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