Poor concentration - big big issue when mental health is compromised. Extremely common, and can be associated with loads of different disorders.
Some of the common causes that folks here often have going on include Depression, PTSD, Dissociative disorders.
Then you add in meds. The side effect of many meds prescribed for mental illness also make it really hard to concentrate.
Then you add the consequences of other symptoms: for example, poor diet, and poor sleep, make it almost impossible for our brains to concentrate well, even if the disorder, or the meds we’re taking to treat it, haven’t already done the job.
If you’re taking meds for anxiety:
1) if the meds are a benzo, then yup, you can kiss your ability to concentrate goodbye, because they work by relaxing the body and brain, and Brain tend to stop being anxious because it’s on the verge of checking out and going to sleep. Or
2) if you’re taking an SSRI antidepressant, google the info sheet for the medication. There’s a good chance that poor concentration or focus is on there as a potential side effect. Even if it isn’t, have a chat to your prescriber about trying an alternative.
If it’s a dissociative issue (which is the forum you’ve put the post in, so it warrants special attention!), Ground Ground Ground! Learning to practice mindfulness throughout the day will potentially be really helpful, because it’s a gentle but craaaaazy effective way to train your brain to focus. I also highly recommend Yoga Nidra (google-worthy - it’s not what you probably think it is, and it’s super cool). Any of the skills that wake up that frontal lobe in your brain!
But the simplest path for dissociative lack of focus: learn what grounds you, and put together a Grounding Kit: A smooth stone you can hold in your palm (notice how it goes from cool to warm). Mints you can suck on to wake you brain up. An essential oil like lavender. A stress ball. Get creative!
The grounding kits can work really well for people with ptsd, because our brain can decide it’s going to avoid all the potentially triggering stimulus around us by just hitting the off switch and not focusing on anything at all. Grounding tools can help retrain our brain that some stimulus is actually calming to focus on.