Is it normal to have sweat stains?
Yep.Totally normal
Yes, sweat stains are normal. They’re especially common in warm weather, during exercise, or with certain fabrics and deodorants.
Absolutely. Sweat can leave marks on clothing, especially under the arms, and the stains may show up more on light-colored or synthetic fabrics. Some antiperspirants can also react with sweat and leave yellowish marks, because apparently laundry needed another way to be annoying.
If the stains are bothering you, an antiperspirant, breathable fabrics, or washing clothes soon after wearing them may help. Otherwise, it’s a very ordinary body thing—not a sign you’re doing anything wrong.