Grounding reduces pain

Grounding has been tested for its effect on pain in six small human studies, and the results do not point the same way. The two largest trials that compared grounding with identical-looking sham equipment after hard exercise, in 32 and 22 healthy young adults, found no difference in muscle soreness. A trial of 84 patients the night after lower back surgery found that pain fell more with grounding, by 2.5 versus 1.6 points on a 10-point scale, and an 8-person pilot found less soreness in the 4 grounded men, though it ran no statistical tests.

The other two studies had no separate comparison group: 16 massage therapists scored lower on one pain questionnaire during four grounded weeks but not on another, and 12 adults sleeping on a conductive pad reported less pain. No study has tested grounding in people with a long-term pain condition such as arthritis, chronic back pain or fibromyalgia, and none ran longer than 8 weeks. Three of the six studies were funded by the grounding company Earth FX, and the funding of a fourth could not be read. Whether grounding eases pain that lasts for months has not been tested.

In the surgery trial (Bydgoszcz, Poland, 2025), 84 adults having lower back decompression surgery were randomly assigned to sleep the first night with a grounding pad or an identical pad that was not connected, and all received paracetamol for pain. On the first morning, pain averaged 7.1 in the grounded group and 6.6 in the sham group, so the grounded group started higher; on the second morning it was 4.6 and 5.3. The grounded group averaged 53 years old and the sham group 60, pain was measured on two mornings only, and the trial declares no outside funding.

The exercise trials measured soreness from muscle damage. In Salzburg (2019), 22 students ran downhill and then slept 10 nights on a grounded or sham sheet, with neither they, the testers nor the analysts knowing which; soreness peaked on day 2 and did not differ between groups, although a blood marker of muscle damage rose less and leg strength recovered faster with grounding. In Oregon (2015), 32 young men did 200 half knee bends and then sat grounded or sham-grounded for 4 hours on each of two days; both groups reported moderate pain on days 2 to 4, with no difference. In a 2010 pilot by the same research group, 8 men did calf raises and wore grounded or sham patches and sheets for three days; the sham group rated pain 83 to 86 percent higher, and the grounded men tolerated more pressure from a cuff on the calf before asking to stop. The 2010 and 2015 studies were funded by Earth FX.

In the massage therapist study (Carlsbad, California, 2019), therapists used number-coded cords, sham in the first and last weeks and working in between, at work and on sleep mats at home. Scores on the McGill pain questionnaire fell by the end of the grounded weeks and rose again after the final sham week, with the drop coming from one of the two groups of eight; a second standard pain measure did not change. The study was funded by Earth FX. The 2004 pilot grounded 12 adults with sleep problems, pain and stress on a conductive mattress pad for 8 weeks with no comparison group, and its funding could not be read because the full text is behind a paywall.

The main proposed explanation is that free electrons from the earth's surface neutralize reactive oxygen species released by immune cells at an injury, limiting inflammation around damaged tissue; it was set out by three researchers contracted to a grounding company, two of whom held shares in it. In rats, 21 days on a grounding mat lowered prostaglandin E2, a molecule that makes pain nerves more sensitive, but pain itself was not tested. Indoor grounding products are usually connected through the ground port of a wall outlet, and none of the cited studies assessed the electrical safety of that setup. None of the studies enrolled children or reported including pregnant women.