Which of the following is NOT a symptom of a black widow spider bite?

The correct choice identifies "headache" as not being a typical symptom related to a black widow spider bite. In general, when a person is bitten by a black widow, the most common symptoms include muscle spasms, hypertension (high blood pressure), and potentially paralysis in severe cases due to the neurotoxic venom injected by the spider.

Muscle spasms typically manifest within hours of the bite and can be very painful. Hypertension can also occur as part of the body's stress response to the bite. Paralysis may develop in severe cases, particularly in children and the elderly, due to the nervous system's response to the venom.

While headaches can occur with various medical conditions and reactions, they are not considered a primary symptom of a black widow spider bite. Thus, headache stands out as the correct answer in this context since it does not align with the typical clinical presentation expected from such an envenomation.