Soon after being bitten, the victim may experience muscle fasciculations and perioral tingling and numbness accompanied by a metallic, minty, or rubbery taste. When envenomation is moderate or severe, edema progresses rapidly, and there may be lymphangitis and lymphadenopathy. Weakness, syncope, sweating, nausea, vomiting, chills, and hypotension may ensue. Paresthesias over the scalp and digits are more frequent after bites by the Eastern diamondback, timber, and Pacific rattlesnakes. Respiratory distress is more common after bites by the Mojave and Eastern diamondback rattlesnakes.
Ecchymoses are frequent.
Altered hemostasis may cause gingival, gastrointestinal, and urinary tract bleeding. Coral Snake Venom Fang marks may not be visible. Although pain may occur at the bite site, it is often mild. Swelling is not prominent, and local effects may be limited to paresthesias. Later, sometimes up to 10 hours after a bite, systemic manifestations may appear.