Cancer prevention study The American Cancer Society is seeking county residents, ages 30-65, with no history of cancer to enroll in a study. Sept. 21-Oct. 2. 888-604-5888. www.cps3nova.org.

Breast-feeding support group For mothers and babies. Thursday, 10-11 a.m. Inova Fairfax Hospital, Inova Fairfax Women’s Center, seventh floor, 3300 Gallows Rd., Falls Church. 703-776-6455. Free.

Tai chi beginners practice Gentle outdoor exercise. Saturday, 8-9 a.m. McLean Central Park, 1468 Dolley Madison Blvd., McLean. 703-759-9141. www.freetaichi.org/practice-out.shtml. Free.

Mended Hearts support group For heart surgery patients, their families and friends. Saturday, 11 a.m. Inova Fairfax Hospital, Heart and Vascular Institute, 3300 Gallows Rd., Falls Church. 703-941-8500. Free.

Mental health support Sponsored by the Depression and Bipolar Support Alliance of Falls Church. Saturday, 3-5 p.m. Northern Virginia Mental Health Institute, 3302 Gallows Rd., Falls Church. 703-354-5104. Free.

Grief support group Sponsored by Evercare Hospice and Palliative Care. Monday, 2-3:30 p.m. Sunrise at Mount Vernon, 8033 Holland Rd., Alexandria. 571-262-5200. www.EvercareHospice.com. Free.

Parkinson’s aquatics exercise class Tuesday and Thursday, 10:30-11:30 a.m. Woodlands Retirement Community, 4320 Forest Hill Dr., Fairfax. 703-378-7221. www.parkinsonfoundation.org. $10; care partners, $5; registration required.

I Can’t Hear You A three-part hearing-loss program by the Northern Virginia Resource Center for Deaf and Hard of Hearing. Tuesdays, 10 a.m., through Sept. 24. Hollin Hall Senior Center, 1500 Shenandoah Rd., Alexandria. 703-765-4573. www.hollinhallseniorcenter.org. Free, registration required.

Postpartum mood and anxiety support For mothers and babies. Tuesday, 10-11:30 a.m. Inova Fairfax Hospital, Heart and Vascular Institute, ground-floor conference center, 3300 Gallows Rd., Falls Church. 703-776-6775. Free.

Dementia caregivers support Sponsored by the Shepherd’s Center of Fairfax-Burke. Tuesday, noon-1:15 p.m. Lord of Life Lutheran Church, 5114 Twinbrook Rd., Fairfax. Contact Eileen Thompson. 703-451-8626. eileen.thompson1@gmail.com. Free, registration required.

Teens Who Stutter support group For youths and their family members, speech language pathologists and educators, sponsored by the National Stuttering Association. Tuesday, 7-8:30 p.m. McLean Professional Park, No. 103, 1497 Chain Bridge Rd., McLean. 800-937-8888. mandy@westutter.org. www.westutter.org. Free.

MS support group For those with multiple sclerosis and their family and friends, sponsored by the National Capital MS Society. Wednesday, 7 p.m. Vienna Presbyterian Church, 124 Park St. NE, Vienna. 703-768-4841. Free.

— Compiled by Jean Mack

Submit an item E-mail fxliving@washpost.com at least 14 days before the publication date.