Brooke Shields reveals that she had a grand mal seizure in September — and that Bradley Cooper was by her side as she was taken to the hospital.

Brooke Shields shared that she had a “grand mal seizure," which she attributed to drinking too much water. Here's what to know about the potentially adverse effects.

Brooke Shields, 58, revealed in Glamour's Women of the Year Issue that she recently suffered a grand mal seizure and Bradley Cooper helped her.

Brooke Shields revealed she recently experienced a grand mal seizure from drinking too much water, a rare but scary condition known as water toxicity.

Brooke Shields revealed she recently experienced a grand mal seizure from drinking too much water, a rare but scary condition known as water toxicity.

Brooke Shields revealed she recently experienced a grand mal seizure from drinking too much water, a rare but scary condition known as water toxicity.

Brooke Shields revealed she recently experienced a grand mal seizure from drinking too much water, a rare but scary condition known as water toxicity.

Brooke Shields revealed she recently experienced a grand mal seizure from drinking too much water, a rare but scary condition known as water toxicity.