Why Do My Nails Hurt?
The honest verdict
This is usually not an allergy
Painful nails are rarely caused by an allergy. Most cases result from physical injury (stubbing, crushing, or repetitive pressure from tight shoes), infections (bacterial paronychia or fungal nail infections), or structural issues like ingrown toenails. Allergic contact dermatitis from nail products (polish, hardeners, acrylics, or adhesives) can cause redness, swelling, itching, or tenderness around the nail, but deep nail pain is uncommon. If the pain is sharp, throbbing, or accompanied by signs of infection, a non-allergic cause is far more likely.
This is a general research summary, not a diagnosis. It can't tell you what's causing your symptom — a clinician can.
Check this first
When painful nails is an emergency
Most of the time this can be handled calmly. But a few signs mean you shouldn't wait. Match what you're seeing to the right level of care below.
If any emergency sign below is present, call 911 or go to the ER now.
- Emergency
Pain with signs of spreading infection: red streaking up the finger or toe, fever, chills, or swollen lymph nodes — go to the ER or urgent care immediately (possible cellulitis or bone infection).
Call 911 or go to the ER now
- Urgent
Severe throbbing pain under the nail with visible dark bruising covering more than half the nail, especially after an injury — seek urgent care (possible subungual hematoma needing drainage).
Get seen today — urgent care or same-day visit
- Urgent
Nail pain with sudden swelling of the entire finger or toe, especially if you have diabetes or poor circulation — seek medical evaluation promptly.
Get seen today — urgent care or same-day visit
- See a doctor
Pus, warmth, or increasing redness around the nail that does not improve with home care in 2-3 days — see a clinician (possible paronychia needing antibiotics or drainage).
Book a routine visit with a clinician
- See a doctor
Pain that persists for more than two weeks without an obvious cause, or a nail that is lifting, crumbling, or changing color — see a clinician (possible fungal infection, psoriasis, or other condition).
Book a routine visit with a clinician
When in doubt, err toward getting seen. These tiers are a general guide, not a substitute for a clinician's judgment about your specific situation.
Key facts
Ingrown toenails are one of the most common nail problems, affecting about 2-5% of the population, with the big toe being the most frequently involved.
Fungal nail infections account for about 50% of all nail disorders and are more common in toenails than fingernails, especially in older adults and people with diabetes.
Allergic contact dermatitis from nail cosmetics — especially acrylates in gels and acrylics — is a growing concern, but it typically causes skin reactions around the nail rather than deep nail pain.
What's causing it
The same symptom can come from very different places. Here are the usual suspects for Fingernails and toenails — the hard keratin plates on the tips of fingers and toes, including the nail bed, nail folds, and surrounding skin, tagged by mechanism and how common each one is — so you can see where an allergy actually fits.
Nail injury (trauma)
Stubbing a toe, dropping something on a finger, or crushing a nail in a door can cause immediate pain and bruising (subungual hematoma). Repetitive pressure from tight shoes or running can also cause toenail pain. Most injuries heal on their own, but severe bruising or nail detachment may need medical attention.
Ingrown toenail (onychocryptosis)
The corner or edge of a toenail grows into the surrounding skin, causing sharp pain, redness, and swelling — most often on the big toe. It is commonly caused by improper nail trimming, tight shoes, or injury. Mild cases can be managed with soaking and careful trimming; persistent or infected ingrown nails may need a clinician's care.
Paronychia (nail fold infection)
A bacterial or fungal infection of the skin around the nail (the nail fold) causes redness, swelling, warmth, and throbbing pain. Acute paronychia often follows a hangnail, minor injury, or excessive hand-washing. Warm soaks and topical antibiotics may help; pus or spreading redness requires medical treatment.
Fungal nail infection (onychomycosis)
A fungal infection that thickens, discolors (yellow, white, or brown), and distorts the nail. It can cause tenderness or pain, especially when wearing shoes or applying pressure. Fungal infections are more common in toenails and are often treated with topical or oral antifungal medications prescribed by a clinician.
Allergic contact dermatitis from nail products
Allergic reactions to nail polish, hardeners, acrylics, gels, or adhesives (especially those containing acrylates, formaldehyde resin, or tosylamide) can cause redness, itching, swelling, and tenderness around the nail or on the fingertips. Deep nail pain is uncommon; symptoms typically improve when the product is removed. A patch test by a dermatologist can confirm the allergen.
Nail psoriasis or other skin conditions
Psoriasis can affect the nails, causing pitting, thickening, crumbling, and separation from the nail bed (onycholysis). These changes can be painful, especially when the nail lifts or catches on clothing. Nail psoriasis often occurs with skin psoriasis elsewhere, but can appear alone. A dermatologist can diagnose and treat it.
Is this an allergy? Usually, no
It's a common assumption, so it's worth being clear about — and pointing you toward what's more likely going on.
Painful nails are usually not an allergy. Allergic reactions to nail products — such as nail polish, hardeners, acrylics, gels, or adhesives — can cause redness, itching, swelling, and tenderness around the nail (allergic contact dermatitis), but deep nail pain is uncommon. These reactions are caused by chemicals like acrylates, formaldehyde resin, or tosylamide. If you develop redness, itching, or a rash around the nail after using a new nail product, removing the product often resolves the symptoms. A dermatologist can perform patch testing to identify the specific allergen. Most nail pain, however, comes from injury, infection, or structural issues like ingrown nails.
Because an allergy is unlikely to be the driver, the most useful next step is a clinician who can look at the actual cause — not an allergy test.
Relief you can try at home
If your symptom is mild and you have no red-flag signs, these gentle steps often help. They soothe — they don't replace figuring out the cause.
- 1
Soak in warm water
For ingrown toenails, paronychia, or minor injuries, soak the affected finger or toe in warm water with Epsom salts for 15-20 minutes, 2-3 times daily. This reduces swelling and helps drain minor infections.
- 2
Elevate and ice
For recent injuries, elevate the hand or foot and apply an ice pack wrapped in a cloth for 15 minutes at a time to reduce swelling and pain. Avoid direct ice on the skin.
- 3
Keep the area clean and dry
Gently clean the nail and surrounding skin with mild soap and water, then pat dry. For minor paronychia, apply an over-the-counter antibiotic ointment and cover with a clean bandage.
- 4
Wear comfortable shoes
If toenails are painful, wear shoes with a wide toe box and avoid high heels or tight footwear. Trim toenails straight across to prevent ingrown edges.
Stop any step that makes things worse. If the symptom isn't easing within a few days, check in with a clinician.
When to see a doctor
See a clinician if nail pain is severe, persistent (lasting more than two weeks), or accompanied by signs of infection — redness spreading beyond the nail, warmth, pus, red streaking, fever, or chills. An ingrown toenail that does not improve with home care may need minor in-office treatment. If you have diabetes or poor circulation, seek care promptly for any nail injury or infection. Sudden swelling of the entire digit or red streaking requires urgent evaluation.
Frequently Asked Questions
Allergic reactions to nail products can cause tenderness, redness, and itching around the nail, but deep or throbbing nail pain is uncommon. The pain is usually on the skin around the nail rather than in the nail itself. If you have sharp, throbbing, or deep nail pain, an injury, infection, or ingrown nail is a much more likely cause.
The most common cause is an ingrown toenail — when the corner of the nail grows into the skin, causing sharp pain, redness, and swelling, usually on the big toe. Tight shoes, improper nail trimming, and injury are common triggers. Fungal infections and stubbing the toe are also frequent causes.
Signs of infection include redness that spreads beyond the nail fold, warmth, swelling, pus (yellow or green discharge), throbbing pain, and sometimes fever or red streaking up the finger or toe. If you notice any of these, see a clinician promptly — infections can worsen if untreated.
Nail polish, acrylics, and gels can cause allergic contact dermatitis, leading to redness, itching, and tenderness around the nail. They can also cause mechanical damage — lifting, thinning, or weakening the nail — which may lead to pain. If your nails hurt after applying a product, remove it and give your nails a break. Persistent pain should be evaluated by a dermatologist.
See a clinician if the ingrown toenail is very painful, shows signs of infection (pus, spreading redness, warmth), or does not improve with home soaking and careful trimming after a few days. People with diabetes, peripheral artery disease, or poor circulation should seek care promptly, as infections can become serious more quickly.
Medically reviewed by
Dr. Chet TharpeMD
Last reviewed July 2026
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Read moreThe best next step is a real clinician
This symptom is usually not driven by an allergy, so an allergy test won't give you the answer. A primary care doctor or the right specialist can examine what's actually going on and guide you from there.
Curex focuses on at-home allergy testing and immunotherapy, which isn't the right fit for this symptom — and never a substitute for medical care.
This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. It cannot tell you what is causing your painful nails or whether it is an allergy. If you have any emergency sign — trouble breathing, fast-spreading swelling, sudden weakness or confusion, or severe pain — call 911 or go to the nearest emergency room. For anything that is new, worsening, or persistent, see a licensed healthcare provider. Curex focuses on at-home allergy testing and immunotherapy, which is not the appropriate care for this symptom and never a substitute for a clinician.
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