Robert Ferry Jr., MD, is a U.S. board-certified Pediatric Endocrinologist. After taking his baccalaureate degree from Yale College, receiving his doctoral degree and residency training in pediatrics at University of Texas Health Science Center at San Antonio (UTHSCSA), he completed fellowship training in pediatric endocrinology at The Children's Hospital of Philadelphia.
Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.
Symptoms of type 1 diabetes are often dramatic and come on very suddenly.
Type 1 diabetes is usually recognized in childhood or
early adolescence, often in association with an illness (such as a virus or
urinary tract infection) or
The extra stress can cause diabetic ketoacidosis.
Symptoms of ketoacidosis include
nausea and vomiting.
Dehydration and often-serious disturbances in blood levels of
Without treatment, ketoacidosis can lead to coma and death.
Symptoms of type 2 diabetes are often subtle and may be attributed to aging or obesity.
A person may have type 2 diabetes for many years
without knowing it.
People with type 2 diabetes can develop hyperglycemic
hyperosmolar nonketotic syndrome.
Type 2 diabetes can be precipitated by steroids
If not properly treated, type 2 diabetes can lead to complications such as blindness,
kidney failure, heart disease, and nerve damage.
Common symptoms of both type 1 and type 2 diabetes include:
tired: In diabetes, the body is inefficient and
sometimes unable to use glucose for fuel. The body switches over to
metabolizing fat, partially or completely, as a fuel source. This process
requires the body to use more energy. The end result is feeling fatigued or
Unexplained weight loss: People with diabetes are
unable to process many of the calories in the foods they eat. Thus, they may
lose weight even though they eat an apparently appropriate or even an excessive
amount of food. Losing sugar and water in the urine and the accompanying
dehydration also contributes to weight loss.
Excessive thirst (polydipsia): A person with diabetes develops high blood sugar levels, which overwhelms the kidney's ability to reabsorb the sugar as the blood is filtered to make urine. Excessive urine is made as the kidney spills the excess sugar. The body tries to counteract this by sending a signal to the brain to dilute the blood, which translates into thirst. The body encourages more water consumption to dilute the high blood sugar back to normal levels and to compensate for the water lost by excessive urination.
Excessive urination (polyuria): Another way the body
tries to rid the body of the extra sugar in the blood is to excrete it in the
urine. This can also lead to dehydration because a large amount of water is
necessary to excrete the sugar.
Excessive eating (polyphagia): If the body is able, it
will secrete more insulin in order to try to manage the excessive blood
sugar levels. Moreover, the body is resistant to the action of insulin in type 2
diabetes. One of the functions of insulin is to stimulate hunger. Therefore,
higher insulin levels lead to increased hunger. Despite increased
caloric intake, the person may gain very little weight and may even lose
Poor wound healing: High blood sugar levels prevent
white blood cells, which are important in defending the body against bacteria
and also in cleaning up dead tissue and cells, from functioning normally. When
these cells do not function properly,
wounds take much longer to heal and
become infected more frequently. Long-standing diabetes also is associated
with thickening of blood vessels, which prevents good circulation, including the delivery of enough oxygen and other nutrients to body tissues.
Infections: Certain infections, such as
frequent yeast infections of the genitals, skin infections, and frequent
urinary tract infections, may result from suppression of the immune system by
diabetes and by the presence of glucose in the tissues, which allows bacteria
to grow. These infections can also be an indicator of poor blood sugar control in a
person known to have diabetes.
Altered mental status: Agitation, unexplained
irritability, inattention, extreme lethargy, or confusion can all be signs of
very high blood sugar, ketoacidosis, hyperosmolar hyperglycemia nonketotic
syndrome, or hypoglycemia (low sugar). Thus, any of these merit the immediate
attention of a medical professional. Call your health care professional or 911.
Blurry vision: Blurry vision is not specific for diabetes but is frequently present with high blood sugar levels.
Reviewed by Melissa Conrad Stöppler, MD on 4/10/2013