Tear gas hits almost every sensory system at once. Within 20 to 60 seconds of exposure, you feel intense burning in your eyes, a choking tightness in your throat, and a stinging heat across any exposed skin. The experience is fast, overwhelming, and designed to be unbearable enough to make you leave the area immediately.
What Your Eyes Go Through
The eyes are the first and hardest-hit target. The sensation is often described as intense burning, as though something gritty and hot has been rubbed directly into them. Your eyelids clamp shut involuntarily, a reflex called blepharospasm, and tears pour out in volume. Vision blurs, bright light becomes painful, and you may feel a persistent “something stuck in my eye” sensation even when nothing is there. In a review of CS gas exposure cases published by the American Academy of Ophthalmology, 57% of people reported eye-related effects including pain, heavy tearing, and visible redness of the white of the eye.
For most people, the eye symptoms are the most disabling part of the experience. The forced eye closure and blurred vision make it nearly impossible to navigate your surroundings, which compounds the sense of panic.
How It Feels in Your Throat and Lungs
Almost simultaneously with the eye pain, you feel a burning sensation in your nose, mouth, and throat. Breathing becomes difficult, not because your airway is physically blocked, but because each inhale feels like it’s pulling fire deeper into your chest. People commonly describe coughing, choking, shortness of breath, chest tightness, and in some cases wheezing. The instinct is to gasp for air, but deeper breaths only draw in more of the agent and intensify the burning.
This respiratory distress is one reason tear gas is so effective at dispersing crowds. The feeling of suffocation triggers a primal urge to flee. In rare cases, particularly in enclosed or poorly ventilated spaces, exposure can cause more serious reactions like spasm of the voice box or fluid buildup in the lungs.
The Skin Burning
Any skin that the gas contacts, especially moist areas like the neck, armpits, and face, develops a burning, stinging sensation. Sweaty skin reacts more intensely because moisture helps the chemical particles dissolve and penetrate. The feeling is similar to a mild chemical burn: hot, raw, and prickling. A rash or visible redness often follows. One of the older tear gas compounds, CN (chloroacetophenone), tends to cause more severe skin injuries than the more commonly used CS gas.
Heat and humidity make the skin effects worse. In hot weather, when pores are open and skin is damp, the irritation is noticeably more intense than in cool, dry conditions.
The Psychological Experience
Beyond the physical pain, tear gas produces a psychological state that catches many people off guard. Disorientation, panic, nausea, headaches, and dizziness are all commonly reported. The combination of not being able to see, not being able to breathe comfortably, and feeling intense pain across multiple body parts at once creates a sense of helplessness. Some people vomit. Others describe a feeling of suffocation that triggers deep anxiety, even after they’ve moved to cleaner air.
This psychological component is not a side effect. It is part of how these agents work. The panic and disorientation are what make people stop what they’re doing and move away from the area.
Why It Hurts So Intensely
Tear gas chemicals activate a specific pain receptor found throughout your eyes, nose, mouth, lungs, and skin. This receptor is the same one your body uses to detect harmful irritants in your environment. When a tear gas compound binds to it, it locks on through a strong chemical bond that keeps the receptor firing continuously rather than fading quickly. This triggers a cascade: calcium floods into nerve cells, the nerves fire pain signals, and the body releases inflammatory substances that cause swelling, mucus production, and redness.
Pepper spray (OC) works through a closely related but different receptor, the same one activated by chili peppers. The result is similar but tends to produce an even more intense burning sensation on the skin and face. Both types cause the release of the same inflammatory signaling molecule, which is why the pain and swelling profile overlaps so much.
CS Gas vs. Pepper Spray
The term “tear gas” gets applied loosely to several different chemicals. The most common are CS gas (used widely by law enforcement and military) and OC, the active ingredient in pepper spray. Both hit within 20 to 60 seconds, and both cause eye pain, tearing, respiratory distress, and skin irritation. But the quality of the pain differs slightly.
- CS gas produces sharp, stinging pain in the eyes and a tight, choking feeling in the chest. Skin effects are typically moderate: redness and burning that resolve relatively quickly.
- OC (pepper spray) tends to produce a deeper, more searing burn on the face and skin, along with severe eye swelling that can temporarily close the eyelids completely. It more commonly causes nausea, vomiting, and a pronounced feeling of suffocation. Psychological effects like panic and anxiety are particularly noted with OC.
- CN gas, an older compound, causes more serious skin burns than either CS or OC and is less commonly used today partly for that reason.
How Long the Effects Last
Once you move to fresh air and remove contaminated clothing, most symptoms begin to fade within 15 to 30 minutes. Eye tearing and redness usually resolve first. Skin burning can linger somewhat longer, especially if the agent isn’t washed off promptly. Rinsing exposed skin and eyes with large amounts of clean water helps speed recovery.
For most people, the experience is genuinely temporary. But not always. In a study of 93 people with significant tear gas exposure, respiratory symptoms like coughing and chest tightness persisted for 10 months in a small subset of cases. Dry eye symptoms have been documented two weeks after pepper spray exposure. People exposed in confined spaces, where concentrations are much higher, face a greater risk of these prolonged effects. Runny nose, watery eyes, and skin irritation (dermatitis) have been reported at higher rates in exposed individuals even a year later, though the differences from unexposed groups were not statistically significant in at least one study.
What Helps After Exposure
The single most important step is getting to fresh air as quickly as possible. After that, removing outer clothing prevents the chemical particles trapped in fabric from continuing to irritate your skin and eyes. Flushing your eyes with clean water for several minutes helps clear residual agent. Washing exposed skin with soap and water is more effective than water alone, since some tear gas compounds are not fully water-soluble.
Avoid touching your face before washing your hands, as residue on your fingers can reintroduce the agent to your eyes. Contact lenses should be removed and discarded, since they can trap particles against the eye surface. Cool water is generally preferable to warm, which can open pores and increase skin absorption. Most people recover fully with these basic decontamination steps and time.