Stinging nettle Toxic?

Updated 2026-03-06| 5 min read| 4,240 found this helpful

No inherently toxic plant parts exist, but all plant surfaces have stinging hairs that cause strong skin irritation

No confirmed systemic toxicity to cats, dogs, or horses has been documented for this species

The plant is at high risk of being confused with other Urtica species and plants in the Lamiaceae family

FAQ

Is Stinging nettle toxic to Humans?

Intense localized skin itching, redness, swelling, and burning sensation at the contact site, no systemic effects reported (Non-toxic)

Is Stinging nettle toxic to Cats?

Localized skin or oral irritation if contacted or chewed, no confirmed systemic toxicity (Non-toxic)

Is Stinging nettle toxic to Dogs?

Localized skin or oral irritation if contacted or chewed, no confirmed systemic toxicity (Non-toxic)

Is Stinging nettle toxic to Horses?

Localized skin or oral irritation if contacted or chewed, no confirmed systemic toxicity (Non-toxic)

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Toxicity Details

Humans

Non-toxic

Intense localized skin itching, redness, swelling, and burning sensation at the contact site, no systemic effects reported

Cats

Non-toxic

Localized skin or oral irritation if contacted or chewed, no confirmed systemic toxicity

Dogs

Non-toxic

Localized skin or oral irritation if contacted or chewed, no confirmed systemic toxicity

Horses

Non-toxic

Localized skin or oral irritation if contacted or chewed, no confirmed systemic toxicity

Toxicity Snapshot

Toxic PartsNo inherently toxic plant parts; all above-ground parts have stinging hairs that cause contact irritation

Exposure RouteDirect skin contact, accidental ingestion of plant material

Toxic CompoundsHistamine; Acetylcholine; Serotonin; Formic acid

First Aid & Prevention

First 30 Minutes

• Wash affected contact area thoroughly with cool soapy water immediately after exposure
• Apply a cold compress to the irritated area to reduce swelling and itching
• Avoid scratching irritated areas to prevent secondary bacterial infection
• If ingested, rinse mouth with clean cool water to reduce oral irritation

Contact Vet Immediately

• If your pet shows persistent swelling, difficulty breathing, or severe discomfort after contact or ingestion
• If localized irritation does not resolve within 24 hours for exposed animals
• If your pet ingests large quantities of the plant and develops unusual symptoms

Prevention

• Wear protective gloves when handling this plant to avoid skin irritation
• Keep pets and children away from dense patches of stinging nettle
• Avoid planting stinging nettle in accessible home gardens or pet play areas

Treatment & Prognosis

• Topical antihistamine creams for mild human skin irritation
• Veterinary-administered antihistamines or anti-inflammatory medications for severe animal reactions
• Supportive care for localized irritation symptoms as required

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Professional Toxicology

Scientific NameUrtica dioica L.

AliasesCommon nettle、Grosse Brennnessel (German)、Ortie dioïque (French)、Ortica comune (Italian)

Toxicity Grade

HumansNon-toxic

CatsNon-toxic

DogsNon-toxic

HorsesNon-toxic

Target Organs

SkinMucous membranesOral cavity (if ingested)

Mechanism of Action

• Hollow stinging hairs on plant surfaces break on contact and inject irritant compounds into skin or mucous membranes, triggering localized inflammatory reactions

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Small mammals (rabbits, guinea pigs): Mild localized irritation on contact, no systemic toxicity reported

Ruminant livestock (cattle, sheep): Mild oral irritation if consumed in large quantities, confirmed systemic toxic effects are extremely rare

Confusion Risk

The following plants look similar and may be confused:

Other nettle species Urtica spp.

Other Urtica species share highly similar serrated leaf shape, leaf structure, and growth habits; most also have stinging hairs, key difference is primarily in flower structure and mature plant size

Lamiaceae (mint family) plants Lamiaceae spp.

Some Lamiaceae species have similar serrated leaf shapes resembling stinging nettle; key difference is Lamiaceae lack stinging hairs and have characteristic square stems

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Related Toxic Plants

Tree nettle

Urtica ferox

Moderate toxicity, can cause severe systemic reactions in rare cases

Gympie-gympie stinging tree

Dendrocnide moroides

Severe toxicity, extremely painful stings that can persist for months

Canadian wood nettle

Laportea canadensis

Low toxicity, causes intense long-lasting skin irritation

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Data Sources

1. CliniTox (Universität Zürich)

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.