[Non-algesic acute conditions: constipation, nausea and sickness in tumor and other patients].

Constipation, nausea and sickness are frequent accessory symptoms in patients suffering from chronic pain. Typical causes are the underlying disease and the medical treatment against chronic pain. Most often opioid treatment induces an enteric dysfunction syndrome with constipation as a leading symptom and, especially in the initial phase, nausea due to direct stimulation of central structures. Therefore prophylactic and therapeutic strategies should be determined routinely and additionally, in special cases, different reserve measures might be applied.