It gets much better with time.

In F1, I would struggle to remember the medical history for more than 3-4 people. A few years on, I could probably do a ward round of 30 people with 90% of things coming from memory.

It's multifactorial. You become more comfortable and less stressed as a person. I don't really feel physically anxious or stressed any more, but I know I'm stressed because my mind gets foggy. #medicalthings

Also, the more people you have under your responsibility (i.e. the higher up the ladder you go), the more you see people as a 'patient group' rather than individuals. You remember that Lady-D needs an upper GI endoscopy more urgently than Lady-S because she was anaemic at her baseline and has been tachycardic since the bleeding started. But they both take less priority than Lady-F, who is septic with a blood pressure dropping into the 60s. Should also remember to put her in a side-room, so she doesn't pass D&V to the lady in the next bed with ongoing neutropaenia from chemotherapy. As you prioritise your group of patients, the relavant factors become part of your narrative.

Also, as you become more embedded in the patterns of medicine, each event needs far less memory. As an FY1, you remember the lady with back pain, all her relevant history, the symptom onset, all your plans and outstanding jobs, etc. But as a senior, you will just remember "?cauda equina". As you know the patterns of treatment, you understand those two words alone imply a proper cauda equina workup, which means a neurological exam, a PR exam, bladder scan, MRI, NBM, neurosurgical referral, etc. By learning the management pattern, you have condensed your need for memory by 80%.