Brief Answer:
Not endoscopy but colonoscopy can be done if all other treatment fails.

Detailed Answer:
Hello mam, thank you for choosing healthcare magic. Chronic constipation is seen in the following conditions :
1)Tiny tears in the skin around the anus (anal fissure)
2)A blockage in the intestines (bowel obstruction)
3)Colon cancer
4)Narrowing of the colon (bowel stricture)
5)Other abdominal cancer that presses on the colon
6)Rectal cancer
7)autonomic neuropathy
8)multiple sclerosis
9) Parkinson's disease
10)spinal cord injury
11)diabetes
12) hypothyroidism
Treatment is as follows :
1) treatment depends upon the underlying cause.
2)laxatives are prescribed first for few days.
3)syrup looz 20 ml daily at bed time is prescribed
4)If constipation persists, syrup cremaffin is prescribed.
5) If constipation persists, then further evaluation is done.
6) endoscopy is not needed but colonoscopy can be done in recalcitrant cases.
Hope i have answered your question. Please let me know if you need any further assistance. Thank you. Take care.

---