Camphor is a waxy, strong-smelling compound used primarily as a topical pain reliever, cough suppressant, and anti-itch treatment. You’ll find it in familiar products like Vicks VapoRub, Tiger Balm, Icy Hot, and Sarna lotion. The FDA recognizes camphor for three over-the-counter uses: as a topical analgesic and anesthetic for pain, as a topical cough suppressant, and as a treatment for itching.
Pain Relief for Muscles and Joints
Camphor’s longest-standing use is as a counterirritant, a substance that creates a sensation on the skin strong enough to distract from deeper pain. When you rub a camphor-containing cream or balm onto a sore muscle or aching joint, it activates cold-sensing receptors in your skin. These receptors respond to camphor much the way they respond to a drop in temperature, producing a cooling, tingling feeling that overrides pain signals traveling from the affected area.
This cooling effect isn’t just a sensation. Camphor actually makes your skin more sensitive to cold by amplifying the activity of those temperature receptors. The result is a prolonged feeling of coolness that outlasts the initial application, which is why products like Tiger Balm and Icy Hot can provide relief that lasts well beyond the moment you apply them. Camphor also mildly increases blood flow to the area where it’s applied, which can help with stiffness in muscles and joints.
Common conditions people use it for include sore backs, stiff necks, arthritis pain, sprains, and general muscle soreness after exercise. It won’t treat the underlying cause of the pain, but for temporary relief, it’s effective enough that the FDA classifies it as a topical analgesic.
Cough and Chest Congestion
Camphor is an FDA-approved topical cough suppressant, and this is the use most people encounter first, usually in the form of Vicks VapoRub rubbed on the chest and throat. The strong vapors stimulate cold receptors in the airways, creating the sensation of breathing more freely even when mucus production hasn’t actually changed. It’s a sensory effect rather than a chemical decongestant, but the subjective relief is real and measurable in studies of nighttime cough in children and adults.
For chest congestion during colds, camphor is typically combined with menthol and eucalyptus oil in vapor rubs. The product is applied to the chest, throat, or sometimes under the nose so the vapors can be inhaled. Some people also add camphor-containing products to hot water and inhale the steam, though the most common approach remains direct skin application at bedtime to ease nighttime coughing.
Itch Relief
The same cooling mechanism that makes camphor useful for pain also makes it effective against itching. Products containing camphor and menthol (like Sarna lotion and Rhuli cream) are used for insect bites, minor skin irritation, rashes, and general itchiness. The cooling sensation competes with itch signals, temporarily suppressing the urge to scratch. This can be especially helpful for conditions where scratching makes things worse, like eczema flares or poison ivy.
Traditional Medicine Uses
Camphor has been a staple in traditional medicine systems for centuries, long before its modern FDA-approved roles were established. It has historically been used as a remedy for chest congestion, bronchitis, asthma, and inflammation-related conditions including rheumatism. In traditional preparations, it’s typically formulated as a balm, oil, or cream applied to the skin over painful or inflamed areas. Many of the products available today, including Tiger Balm, trace their formulations directly to these traditional uses.
Concentration Limits and Why They Matter
The FDA limits camphor in consumer products to a maximum concentration of 11 percent. This cap exists not because higher concentrations work better, but because they don’t. An FDA panel found that concentrations above 11 percent provide no additional benefit as a counterirritant while significantly increasing the risk of serious reactions if the product is accidentally swallowed. When manufacturers petitioned to raise the limit to 25 percent, the agency refused on exactly these grounds.
Most over-the-counter products contain between 3 and 11 percent camphor, depending on the intended use. Vapor rubs for cough tend to sit at the lower end (around 4 to 5 percent), while pain-relief balms may go higher.
Safety Risks, Especially for Children
Camphor is safe when used topically as directed, but it becomes dangerous quickly when swallowed. As little as half a gram taken by mouth can be lethal in a child. Gastrointestinal irritation and nervous system depression can begin at doses over 10 mg per kilogram of body weight, and serious toxicity has been reported in children who ingested more than 30 mg per kilogram. Seizures can occur within 90 minutes of ingestion, sometimes preceded by confusion, restlessness, or hallucinations. Respiratory depression often follows.
Because of these risks, the American Academy of Pediatrics recommends that camphor be avoided in children altogether, citing its limited effectiveness and well-documented toxicity potential. Camphor appears on the Key Potentially Inappropriate Drugs in Pediatrics list due to seizure risk. Most reported poisoning cases involve accidental oral ingestion, but toxicity has also been reported from topical application in infants, whose thin skin absorbs the compound more readily.
If you have camphor products at home and young children in the house, store them the same way you’d store any medication: out of reach and ideally in a locked cabinet. The strong, pleasant smell of many camphor products can make them appealing to small children, which is exactly what makes accidental ingestion a recurring problem.
How Camphor Works in the Body
Camphor produces its effects by activating a specific type of receptor in your skin cells called a cold-sensing channel. This is the same receptor that responds to menthol and to actual drops in temperature. When camphor binds to these receptors, it triggers a sensation of coolness and amplifies your skin’s response to cold. In lab studies, camphor dramatically extended the duration of cold-sensing receptor activity during mild cooling, increasing it from about 26 seconds to nearly 139 seconds.
Interestingly, camphor and menthol don’t play well together. Despite both activating the same receptor, camphor actually blocks about 62 percent of menthol’s effect when the two are applied simultaneously. This means products combining both ingredients may produce a different sensation than you’d expect from simply adding their effects together. The two compounds compete for the same receptor, with camphor partially shutting out menthol’s signal while contributing its own.
Another key difference: camphor’s cooling effect is temperature-dependent. It works best when your skin is already somewhat cool (around 77°F or 25°C) and produces very little response at normal skin temperature (around 90°F or 32°C). This helps explain why camphor products often feel most noticeable in cooler environments or after the initial application cools the skin surface through evaporation.