The first healing crisis may be nausea. The potential for nausea was already there, in suppressed form. Healing may progress to the intestines. You may re-experience constipation or diarrhea. Other problems in the intestines will also manifest as regeneration proceeds.
Healing progresses to the endocrine system.
Suppressed enthusiasm will be effected by dissolving crystalized pineal gland reflexes. The pituitary gland is directly related to suppressed pain. The thyroid and parathyroid are related to suppressed anger. The pancreas and adrenals are related to suppressed grief. Spleen problems show up as apathy.