Connecticut U.S. Rep. John Larson, who inexplicably stopped speaking during a speech Monday on the House of Representatives floor, says he suffered a complex partial seizure.

Rep. John Larson (D-Conn.) said Tuesday that a "complex partial seizure" was what caused him to seize up during a House floor speech the previous day. Why it matters: The 76-year-old's office had initially said the incident — which quickly went viral on social media — was likely caused by an "adverse reaction to a new medication.

John Larson faced a health scare mid-speech on the House floor, pausing unexpectedly. His office stated it was an ‘adverse reaction’ to a new medication.

Rep. John Larson stalled and seemingly froze mid-speech on the House of Representatives floor, according to an alarming clip of the moment — which his team claimed to be an “adverse reaction” to a newly prescribed medication.