Herbal remedies could have affect patients at risk of .
The cold weather can put a strain on fragile hearts, the British Heart Foundation has said.
Following last week's National Fuel Poverty Awareness Day, cardiac nurse Cathy Ross, has warned of the effects which cold temperatures can have on the heart.
Ms Ross said: "People are more at risk of dying from heart conditions in winter than in other seasons.
"This may be because cold temperatures can lead to an increase in heart rate and blood pressure, which can trigger an angina attack."
She added that there is some research to suggest that blood thickens in cold weather, hence adding to the chances of a clot forming.
The cardiac expert advised people to dress warmly and avoid spending long periods of time in low temperatures in order to reduce the chances of heart complications.
Regular health check ups are all the more important in the winter months, with 36,700 excess winter deaths recorded in England and Wales during the cold months of 2008 and 2009.