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What does it mean if your ACTH is low?

By Sarah Oconnor

What does it mean if your ACTH is low?

Low levels of ACTH may be caused by: Damage to the pituitary gland from surgery, radiation, stroke, head injury, or a tumor. An increased amount of cortisol from a tumor in the adrenal glands (Cushing’s syndrome)….ACTH and cortisol levels in specific conditions.

ConditionACTHCortisol
HypopituitarismLowLow

Is low ACTH normal?

ACTH level high (values greater than 200 pg/ml) supports primary adrenal insufficiency; low or normal ACTH (normal range: 20-50 pg/ml) with low AM Cortisol – secondary adrenal insufficiency.

What does low ACTH and low cortisol mean?

Low ACTH and high cortisol levels: This may mean Cushing’s syndrome or a tumor of the adrenal gland. High ACTH and low cortisol levels: This may mean Addison disease. Low ACTH and low cortisol levels. This may mean hypopituitarism.

Is low cortisol life threatening?

People with those problems frequently lack other key hormones made by the pituitary gland, such as ACTH, which directs the adrenal gland to make cortisol, a hormone necessary for life. Having too little cortisol can be fatal if not properly treated.

What stimulates ACTH?

Corticotropin-releasing hormone (CRH) is released from the hypothalamus, which stimulates the anterior pituitary to release adrenocorticotropic hormone (ACTH).

What does low cortisol feel like?

Low levels of cortisol can cause weakness, fatigue, and low blood pressure. You may have more symptoms if you have untreated Addison’s disease or damaged adrenal glands due to severe stress, such as from a car accident or an infection. These symptoms include sudden dizziness, vomiting, and even loss of consciousness.

What organs does ACTH target?

Endocrine gland/ source of hormoneHormoneTarget organ or tissue
Anterior pituitary (adenohypophysis)ACTH (adrenocorticotrophic hormone)Adrenal cortex
FSH (follicle stimulating hormone)Ovaries / testes (tubules)
LH (luteinizing hormone)Ovaries / testes (Leydig cells)
GH (growth hormone)All tissues