Hi ladies,
Stellajane, I have the same pattern. No night urgency but in the morning I can smell the coffee after 3 or 4 toilet trips.
I think many things play a role, one is hormones. Antidiuretic hormone (ADH) or vasopressin is the hormone that tells your kidneys to absorb water according to the baroreceptors spread throughout your blood vessels. It is produced and stored in the the brain and does not seem to be affected by ageing and menopause. The other hormone is oestrogen with its multitude of actions, one being directly related to genital integrity, ie. vaginal atrophy and the inability to control the urethra sphincter.
But why in the morning? Most articles and discussions deal with nocturia or nocturnal polyuria, etc. There are only a few that slightly touch the morning or matutinal urination frequency (I couldn't find the technical word, if there is one).
The inability to concentrate urine during ageing seems to be the most important factor. There are few studies on the subject that I could find and most use rats, one of these discussed that some decrease in protein production could be the cause and a poor protein diet would worsen the problem as well as changes in glucocorticoids levels (maybe the link to matutinal/nocturnal different patterns?).
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3670161/My latest urine tests all show a decrease in urine sediment or low specific gravity. None of the doctors said anything about it though. I've read that decreased SG is seen in excessive fluid intake, renal failure, pyelonephritis, and central and nephrogenic diabetes insipidus. False low readings are associated with alkaline urine (eg, a high-citrate diet). My fluid intake is below the average (I simply do not feel thirsty, but I rarely sweat). My renal tests are normal and urine pH readings are acid. I'm vegetarian so maybe my protein intake is low and may contribute to the decrease in urine concentrating ability and the cortisol (glucocorticoids) surges of perimenopause which are worse in the morning.
On a side note, maybe we just sweat less as we age due to less physical exercise and that would be more important in the morning (well, that depends on the level of nocturnal activities,
) and less evident as the day goes by (more activities = more sweating) and thus the need to pee more frequently in the morning... does it make any sense?