Sweat on the back against sweat under the arms

Short answer: The two areas sweat for different reasons. The underarms have the most sweat glands of a particular type, while the back sweats because it is covered and pressed. That is why each area needs its own solution when you choose clothing.

The underarms are dense with glands

The armpit has a high density of sweat glands and very little air circulation. The arm rests close to the body for most of the day, so air struggles to get in. Moisture lingers, and the fabric under the arm quickly becomes damp. A soft layer that absorbs moisture makes a difference here. See bamboo underwear for women.

The back sweats from pressure

A chair back or a backpack traps heat against the back. The back does not necessarily have more glands than elsewhere, but when it is covered and pressed, heat and moisture cannot escape. That is why many people get a damp patch in the middle of the back after a day at a desk. See socks for women.

Two different solutions

Under the arms, a layer that absorbs moisture helps, while on the back it is air that makes the difference. It sounds simple, yet many choose the same thing for both problems. Once you understand the cause, you can pick the layer and fit that suit the spot where you sweat most. See bamboo joggers for women.

The fit under the arms

If a garment is very tight under the arms, the fabric presses against the skin and moisture has nowhere to go. A slightly looser fit around the armpit lets air in, while a thin inner layer takes up the moisture. Together they keep the surface drier through the day than a tight, dense fabric alone.

Give the back some air

For the back, the aim is to create space. A layer that is not pressed flat against the back lets moisture escape. Loosen your backpack now and then, or lean forward from the chair for a few minutes. Short breaks let air in and dry the skin a little before moisture builds up in the fabric.

Think about the whole day

Sweat on the back and under the arms often depends on what you are doing. A day of sitting brings more sweat on the back, while a day of walking and activity may bring more under the arms. Think about what the day holds when you dress in the morning, and choose your layers to match.

Washing and changing

Clothes that have been damp with sweat should be washed before you wear them again. Hang them up to dry rather than folding them away damp. Wash at a low temperature with a mild detergent so the fabric stays soft. If you sweat heavily for no clear reason, talk to your doctor.

Frequently asked questions

Why do the two areas sweat differently

Because the armpit has many glands and little air, while the back sweats because it is pressed and covered. The causes differ, so the solutions do too.

What helps with underarm sweat

A layer that absorbs moisture into the fibre. It keeps the surface drier than a fabric that just moves moisture along, especially if the fit is not too tight.

What helps with sweat on the back

Air. A layer that is not pressed flat against the back gives moisture room to escape, and short breaks from the chair or backpack help as well.