When you experience stress, your body responds by circulating blood faster. A variety of signs and symptoms may be noted, including dilation of the pupils. The brain sends a message to the adrenal gland, telling it to secrete adrenaline. This adrenaline release, which may take from seconds to minutes, occurs when the blood glucose is too low, when the person is scared or excited, or when the body thinks it is at risk. When adrenaline is released, there are many physiological responses.
Adrenaline stimulates an increase in heart and pulse rate.
Blood vessels in the hands and feet narrow. For the person with diabetes, the most common responses experienced with hypoglycemia are due to adrenaline release. This adrenaline release results in weakness, shakiness, and a strong, rapid pulse. These symptoms stop when the blood-glucose levels rise to normal. When the sugar in the system is already high, the person usually feels the response of high blood sugar rather than the adrenaline released.