What can lead to, or is associated with constipation?

The following cause or are associated with Constipation:: Acute intermittent porphyria, Anorexia nervosa, Ascariasis, Botulism, Brucellosis, Chronic spinal cord injury, Diverticulosis, Down syndrome, Familial adenomatous polyposis, Fecal incontinence in adults, Hepatitis A, Hyperparathyroidism, Hypopituitarism, Inguinal hernia, Jet lag, Lead poisoning, Meckel's diverticulum, Nonfunctional pituitary adenoma, Opioid abuse, Parkinson's disease, Pyloric stenosis, Small Bowel Obstruction, South American trypanosomiasis, Typhoid fever, Ulcerative colitis, Uterine prolapse, Vitamin B3 deficiency, Diabetic nerve problems, Underactive thyroid, Lactase deficiency, Fibroid, Femoral hernia, Ventral hernia, Colitis, Hepatitis, Neurofibromatosis, Diverticulitis, Eating disorders, Inflammatory bowel disease, Irritable bowel syndrome, Hashimoto's thyroiditis, Prolapse of the uterus, Rett syndrome, Dysautonomia, Bowel obstruction, Porphyria, Alcoholic hepatitis, Herniated belly button.