Positives

• Patients with CFS on 5 to 10 mg hydrocortisone commonly report reaching normal fatigue scores at roughly three times the rate of patients on no treatment PubMed.
• A separate randomized trial found average symptom improvement around 76% in CFS patients on low-dose hydrocortisone JAMA.
• Patients with documented hypothalamic hypoadrenalism after COVID may benefit from physiologic replacement PMC.

Negatives

• A patient with the neuroimmune cluster of Long COVID (POTS, MCAS, eczema) found that anti-inflammatory drugs including low-dose corticosteroids made their fatigue, drowsiness, and brain fog significantly worse rather than better Reddit.
  
  

Hurdles & Side Effects

• A long-hauler noted that adjusting hydrocortisone dosing was delicate, as even small changes triggered symptom flares, and that long-term steroid use raised concerns about adrenal suppression and dependency Reddit.