Factors Related to Fatigue
Even in patients who have poor sleep, correcting sleep problems does not always decrease fatigue. A lack of sleep may not be what is causing the fatigue.
Medications other than those used in chemotherapy may also contribute to fatigue. Opioids used in treating cancer-related pain often cause drowsiness, the extent of which may vary depending on the individual. Taking opioids over time may lower the amount of sex hormones made in the testes in men and the ovaries in women. This can lead to fatigue as well as sexualdysfunction and depression. Other types of medications such as tricyclic antidepressants and antihistamines may also produce the side effect of drowsiness. Taking several medications may compound fatigue symptoms.