Research shows that the prevalence of PMDD is significantly higher in women with ADHD, compared to women without (approx. 10 fold!).
Most women who have ADHD & PMDD, know that PMDD symptoms can make ADHD symptoms worse; these include symptoms associated with focus and concentration which often aggravate in the lead up to menstruation.
Well, this happens in part due to the fact that hormones such as oestrogen regulate neurotransmitters such as dopamine. Sensitivity to fluctuations in hormones like oestrogen, which drops after ovulation, and again mid-luteal, lead to interference with transmission of dopamine which subsequently aggravates ADHD symptoms.
To ensure ADHD symptoms are not worse in the luteal phase of the cycle, supporting hormonal balance and the resultant fluctuations in neurotransmitters such as dopamine is a key part to feeling better.
Ref: Dorani F, Bijlenga D, Beekman ATF, van Someren EJW, Kooij JJS. Prevalence of hormone-related mood disorder symptoms in women with ADHD. J Psychiatr Res. 2021 Jan;133:10-15. doi: 10.1016/j.jpsychires.2020.12.005. Epub 2020 Dec 3. PMID: 33302160.