TV viewers were treated to a real life drama on Monday's episode of The Block All Stars on Channel 9.
Paramedics took contestant Mark Bower to hospital suffering a suspected heart attack after he complained of chest pains and feeling faint.
Mr Bower was forced to pull out of the competition, but his teammate Duncan Mille, remained and was teamed up with The Block's former competitor Dale Vine.
Tweed Hospital's Kellie Thompson is a cardiac specialist who watched the drama unfold on Monday night.
"The warning signs for a heart attack are tightness, pain or pressure in the chest, arms, back, jaw, shoulders or neck," Ms Thompson said.
"It (the discomfort) is in the upper limbs and generally on the left side.
"People might feel sick, have cold sweats, or dizziness."
Ms Thompson said people should seek medical assistance if they have two or more of these symptoms.
Mr Bower had some of these symptoms.
"People might think it is a bit of reflux. Diabetics don't feel any symptoms," Ms Thompson said.
Mr Bower revealed on the show's website that the health scare had changed his life and he had lost weight since the episode was filmed.