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You have not mentioned your age or sex. It makes a lot of difference you see. Have you lost any weight. It's possible you could be having colonic lesions which produce excess mucous secretion. Since you are having constipation
there could be a mass compressing your colon and increasing it's mucous secretion like an ovarian cyst
in female. If you are female please consult a Gynaecologist to rule out fibroid
, ovarian cyst and if male, please consult a Surgeon to evaluate the mass in your abdomen by clinical examination and required scans.