If erection difficulties are new, persistent or unexplained, discussing them with a GP is a sensible part of the picture.
What a medical check can and cannot tell you.
If tests and assessment do not identify an obvious physical explanation, that is useful information — but it does not divide erectile difficulties neatly into physical or psychological boxes. Contributors are often mixed. It may simply mean that pressure, anxiety, attention and relationship context deserve more attention alongside the medical picture.
Changes in morning erections are useful clinical information. They are not, by themselves, a complete diagnosis.
Situational patterns matter, but they are not proof.
If erections are more reliable alone or in the morning and difficulties are strongly situational, that can suggest an important psychological or contextual component. It does not rule out physical contributors.
If medication is not working as expected.
A poor response to ED medication does not identify the cause by itself. Dose, timing, sexual stimulation, medical factors and anxiety can all matter. If medication is not working as expected, take that back to the prescriber or pharmacist rather than treating it as proof that something is seriously wrong.