Which of the following is NOT typically included in serious causes of headaches?

When considering the serious causes of headaches, it's important to focus on conditions that are directly related to neurological issues or acute systemic illnesses. Meningitis is an infection of the protective membranes covering the brain and spinal cord, and it often presents with a severe headache, fever, and stiff neck. Stroke can also lead to headache, particularly if it is hemorrhagic in nature, as it involves bleeding in or around the brain. Cyanide poisoning, although it affects the body's ability to utilize oxygen and can cause symptoms like headache, confusion, or loss of consciousness, is also recognized as a serious condition that may lead to headache due to systemic toxicity.

In contrast, while a heart attack is a critical medical event, it is primarily related to the cardiovascular system and does not typically present as a headache. Headaches associated with heart attacks are not common and are not considered a primary symptom when diagnosing or assessing this condition. Therefore, it does not fit within the usual serious causes of headaches as seen with the other listed options.