In some cultures in the Northern Hemisphere, the astronomical March equinox (varying between 19 and 21 March) is taken to mark the first day of spring, and the Northern solstice (around 21 June) is taken as the first day of summer. In other traditions, the equinox is taken as mid-spring.
Circulation problems that cause dizziness. You may feel dizzy, faint or off balance if your heart isn't pumping enough blood to your brain. Causes include: 1  Drop in blood pressure.
Symptoms and Complications. If your pulse rate drops too low, you may feel lightheaded, dizzy, faint or very fatigued. You may even be at risk for a heart attack. If you have any of these symptoms, see your doctor.Bradycardia left untreated can lead to chest pain, high blood pressure and heart failure.our doctor can use an electrocardiogram and other heart monitor tests to see if you are at risk. Only your doctor can determine whether your low pulse rate is at a dangerous level for you and prescribe the appropriate treatment.