Symptoms of lactic acidosis are subtle at first and include muscle pain, lethargy, a sense of not feeling well, breathing problems, sleepiness, abdominal aches, nausea, vomiting, and severe weakening of muscles in the legs and arms. In very rare circumstances, metformin has caused lactic acidosis, which is a buildup of lactic acid in the cells and bloodstream; it is fatal in 50% of cases. Less common side effects include abnormal stools, low blood sugar, muscle pain, light-headedness, shortness of breath, nail disorders, rash, increased sweating, taste disorders, chest discomfort, chills, flu symptoms, flushing, and heart palpitations. Today, it kicks in for everyday stressors such as traffic jams, arguments, and work pressures. It's the fight-or-flight response from the days when humans needed to run away from wild animals. The adrenals also release hormones when you're under stress, releasing energy. When blood sugar drops, the adrenals release hormones that cause the blood sugar to rise, increasing energy.

The adrenals produce hormones that help to balance blood sugar, which helps your body to manage daily ebbs and flows of energy.

Some other names for this condition include non-Addison's hypoadrenia, subclinical hypoadrenia, hypoadrenalism, and neurasthenia. Adrenal fatigue often develops after periods of intense or lengthy physical or emotional stress, when overstimulation of the glands finally leaves them unable to meet the body's needs. On the other end, a low-functioning adrenal gland, also called adrenal insufficiency, can slow down overall metabolism and can worsen thyroid problems. On one end, being in a situation of adrenal stress means that you produce too much Cortisol, which can contribute to weight gain, and a constant release of adrenaline can cause resistance to it, making metabolism less efficient. A malfunctioning adrenal system can sabotage weight-loss efforts. There is a strong connection between the function of the adrenal glands and the thyroid. The typical monthly cost for metformin ranges from $33 to $45. Also, people with congestive heart failure, a known sensitivity to metformin, or metabolic acidosis should not take metformin. Patients with kidney disease, a history of shock, heart attack, liver disease, and septicemia should not take metformin.