I've lived a long life, now over 7 decades.
All these decades with a 6th house stellium containing Mercury-Mars-Sun. Mars and the Sun are within 5 degrees of the 7th house, and some consider the 7th when within these few degrees.
My 6th house is ruled by Jupiter but my planets are all in Capricorn there.
I see the 6th (for me) as a house of karma. The Vedic astrologers call it a "growing house" which I suppose means, the soul grows with the opportunities the 6th house offers us, and that is how I've experienced it.
Yes, there were hardships, but perhaps no worse then other people's in life.
I've been sued when Tr Pluto squared my MC over this house and over Mercury -
which was tough during a Pluto transit to this house and planets, and I've had good things occur as well, such as when Mars was triggered here in the "chronic health issues" house. Since my Mars is in Capricorn, it's considered exalted, so when Pluto and Saturn appeared within orb of a conjunction, the skin issues (psoriasis) I've been plagued with since age 25, (for almost 50 yrs. ) suddenly almost magically, disappeared. I still have a little breakout here and there, but for the most part, no one would even know anymore whereas it use to be really bad especially on my legs.
I can add, that when the bad stuff happened, like the civil lawsuit, it took 5 years or so, the whole of the slow moving transit of Pluto to finally be settled. Then the health repairs took place.
Speaking about legs, I also had 2 knee operations in 2 different years when Tr Pluto transformed my health house over Mars-Sun- I had 2 separate knee replacement operations and I can't believe I waited so long they turned out very well and pain free finally.
The thing about Capricorn, is the sign itself rules skin issues, teeth & gums and all the bones of the skeleton in the body. All of these things have plagued me my whole life, and its only when Pluto came about did I finally see real relief. , i.e., "transformation".
I can't say life is great or good now, because of family issues, but it's better then it's ever been in many years for me physically,
Seeing this house as a karmic house means I really believe everything that has happened was for the opportunity to grow and heal the soul of which I am a part.
My father was a Virgo Sun (rules the 6th) and had his Sun-Venus and Moon in this house - He always had service related jobs, as a taxi driver and then for the Social Security Administration for many years. He also suffered his entire life with chronic health issues. Perhaps my weaker immune system was a gift from him.