Hot Flashes and Night Sweats (PDQ®)
Last modified: 2014-10-15
Last downloaded: 2015-11-18
Hot flashes and night sweats may be side effects of cancer or its treatment.
Hot flashes combined with sweats that happen while sleeping are often called night sweats or hot flushes.
Hot flashes and night sweats affect quality of life in many patients with cancer.
A treatment plan to help manage hot flashes and night sweats is based on the patient's condition and goals of care. For some patients, relieving symptoms and improving quality of life is the most important goal.
This summary describes the causes and treatment of hot flashes and night sweats in cancer patients.
Back to Top
Causes of Hot Flashes and Night Sweats in Patients with Cancer
In patients with cancer, hot flashes and night sweats may be caused by the tumor, its treatment, or other conditions.
Sweating happens with disease conditions such as fever and may occur without disease in warm climates, during exercise, and during hot flashes in menopause. Sweating helps balance body temperature by allowing heat to evaporate through the skin.
Many patients treated for breast cancer and prostate cancer have hot flashes.
Menopause in women can have natural, surgical, or chemical causes. Chemical menopause in women with cancer is caused by certain types of chemotherapy, radiation, or hormone therapy with androgen (a male hormone).
Certain types of drugs can cause night sweats.
Drugs that may cause night sweats include the following:
Back to Top
Drug Treatment for Hot Flashes and Night Sweats in Patients with Cancer
Sweats are controlled by treating their cause.
Hot flashes may be controlled with estrogen replacement therapy.
Hot flashes during natural or treatment-related menopause can be controlled with estrogen replacement therapy. However, many women are not able to take estrogen replacement (for example, women who have or had breast cancer). Hormone replacement therapy that combines estrogen with progestin may increase the risk of breast cancer or breast cancer recurrence.
Treatment of hot flashes in men who have been treated for prostate cancer may include estrogens, progestin, antidepressants, and anticonvulsants. Certain hormones (such as estrogen) can make some cancers grow.
Other drugs may be useful in some patients.
Studies of non-estrogen drugs to treat hot flashes in women with a history of breast cancer have reported that many of them do not work as well as estrogen replacement or have side effects. Megestrol (a drug like progesterone), certain antidepressants, anticonvulsants, and clonidine (a drug used to treat high blood pressure) are non-estrogen drugs used to control hot flashes. Some antidepressants may change how other drugs, such as tamoxifen, work in the body. Side effects of drug therapy may include the following:
- Antidepressants used to treat hot flashes over a short period of time may cause nausea, drowsiness, dry mouth, and changes in appetite.
- Anticonvulsants used to treat hot flashes may cause drowsiness, dizziness, and trouble concentrating.
- Clonidine may cause dry mouth, drowsiness, constipation, and insomnia.
Drugs that may relieve nighttime hot flashes or night sweats and improve sleep at the same time are being studied in clinical trials.
If one medicine does not improve symptoms, switching to another medicine may help.
Back to Top
Non-Drug Treatment for Hot Flashes and Night Sweats in Patients with Cancer
Treatments that help patients cope with stress and anxiety may help manage hot flashes.
Treatments that change how patients deal with stress, anxiety, and negative emotions may help manage hot flashes. These are called psychologicalinterventions. Psychological interventions help patients gain a sense of control and develop coping skills to manage symptoms. Staying calm and managing stress may lower levels of a hormone called serotonin that can trigger hot flashes.
Psychological interventions may help hot flashes and related problems when used together with drug treatment.
Hypnosis may help relieve hot flashes.
Hypnosis is a trance-like state that allows a person to be more aware, focused, and open to suggestion. Under hypnosis, the person can concentrate more clearly on a specific thought, feeling, or sensation without becoming distracted.
Hypnosis is a newer treatment for hot flashes that has been shown to be helpful. In hypnosis, a therapist helps the patient to deeply relax and focus on cooling thoughts. This may lower stress levels, balance body temperature, and calm the heart rate and breathing rate.
Comfort measures may help relieve night sweats related to cancer.
Comfort measures may be used to treat night sweats related to cancer. Since body temperature goes up before a hot flash, doing the following may control body temperature and help control symptoms:
- Wear loose-fitting clothes made of cotton.
- Use fans and open windows to keep air moving.
- Practice relaxation training and slow, deep breathing.
Herbs and dietary supplements should be used with caution.
Studies of vitamin E for the relief of hot flashes show that it is only slightly better than a placebo (pill that has no effect). Most studies of soy and black cohosh show they are no better than a placebo in reducing hot flashes. Soy contains estrogen-like substances; the effect of soy on the risk of breast cancer growth or recurrence is not clear. Studies of ground flaxseed to treat hot flashes have shown mixed results.
Claims are made about several other plant-based and natural products as remedies for hot flashes. These include dong quai, milk thistle, red clover, licorice root extract, and chaste tree berry. Since little is known about how these products work or whether they affect the risk of breast cancer, women should be cautious about using them.
Acupuncture may be used to treat hot flashes.
Pilot studies of acupuncture and randomized clinical trials that compare true acupuncture and sham (inactive) treatment have been done in patients with hot flashes. Results are not clear and more studies are needed. (See the Vasomotor symptoms section in the PDQ health professional summary on Acupuncture for more information.)
Back to Top
Current Clinical Trials
Check the list of NCI-supported cancer clinical trials for supportive and palliative care trials about night sweats, hot flashes and hot flashes attenuation that are now accepting participants. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug.
General information about clinical trials is also available from the NCI website.
Back to Top
Changes to This Summary (10/15/2014)
Editorial changes were made to this summary.
Back to Top
Get More Information From NCI
For more information, U.S. residents may call the National Cancer Institute's (NCI's) Cancer Information Service toll-free at 1-800-4-CANCER (1-800-422-6237) Monday through Friday from 8:00 a.m. to 8:00 p.m., Eastern Time. A trained Cancer Information Specialist is available to answer your questions.
The NCI's LiveHelp® online chat service provides Internet users with the ability to chat online with an Information Specialist. The service is available from 8:00 a.m. to 11:00 p.m. Eastern time, Monday through Friday. Information Specialists can help Internet users find information on NCI websites and answer questions about cancer.
Write to us
For more information from the NCI, please write to this address:NCI Public Inquiries Office
9609 Medical Center Dr.
Room 2E532 MSC 9760
Bethesda, MD 20892-9760
Search the NCI websites
The NCI website provides online access to information on cancer, clinical trials, and other websites and organizations that offer support and resources for cancer patients and their families. For a quick search, use the search box in the upper right corner of each web page. The results for a wide range of search terms will include a list of "Best Bets," editorially chosen web pages that are most closely related to the search term entered.
There are also many other places to get materials and information about cancer treatment and services. Hospitals in your area may have information about local and regional agencies that have information on finances, getting to and from treatment, receiving care at home, and dealing with problems related to cancer treatment.
The NCI has booklets and other materials for patients, health professionals, and the public. These publications discuss types of cancer, methods of cancer treatment, coping with cancer, and clinical trials. Some publications provide information on tests for cancer, cancer causes and prevention, cancer statistics, and NCI research activities. NCI materials on these and other topics may be ordered online or printed directly from the NCI Publications Locator. These materials can also be ordered by telephone from the Cancer Information Service toll-free at 1-800-4-CANCER (1-800-422-6237).
Back to Top Source: The National Cancer Institute's Physician Data Query (PDQ®) Cancer Information Summaries (http://www.cancer.gov/cancertopics/pdq)