psychisch
psychological
Relating to a person's soul, mind, or psyche; mental, emotional.
Langanhaltender Stress kann eine große psychische Belastung sein.
Long-term stress can be a major psychological burden.

psychological
Loading your saved state.
psychological
Relating to a person's soul, mind, or psyche; mental, emotional.
Langanhaltender Stress kann eine große psychische Belastung sein.
Long-term stress can be a major psychological burden.

The adjective 'psychisch' (psychological/mental) comes directly from the noun 'die Psyche' (the psyche, the soul, the mind). It describes everything that has to do with a person's mental or emotional state.
Die Prüfung erzeugte bei ihm großen psychischen Druck.
The exam put him under great psychological pressure.
'Psychisch' (psychological/mental) is very often used in fixed combinations. Typical examples are 'psychische Gesundheit' (mental health), 'psychische Belastung' (psychological burden/stress), 'psychische Probleme' (mental health problems), and 'psychische Erkrankung' (mental illness).
Er leidet an einer schweren psychischen Erkrankung.
He suffers from a serious mental illness.
This word is mainly used in contexts dealing with health, well-being, and medicine. It often has a rather formal or technical character.
Nach dem Unfall erhielt er psychische Betreuung.
After the accident, he received psychological support.
inner
'inner' and 'psychisch' can both have to do with a person's mental or emotional state. 'inner' often sounds more personal and general; it describes what someone feels or thinks inside. 'psychisch' is more precise when talking about the psyche, stress, or health. You often hear it in medical or more serious contexts. In everyday language, for example, you say 'innere Ruhe' (inner calm), but for problems or stress, you are more likely to say 'psychische Belastung' (psychological strain).

Die lange Pflege der Eltern war für sie psychisch sehr schwer.
Taking care of her parents for so long was very hard on her psychologically.
Vor dem Gespräch versucht er, seine innere Ruhe zu behalten.
Before the conversation, he tries to keep his inner calm.