The natal Lot of Chronic Illness (ascendant+mars-saturn) falls @ 20 Scorpio:
-in the first house (whole sign) showing an intimate potential relationship of chronic illness with the life of the person (due to 1st house placement of the Lot)
-disposited by Mars (inflammations, etc)
-the Lot is opposed by both Mercury and Jupiter, from Taurus and the 7th house
-the Lot is contained by the North Node and Neptune: indicative of very subtle and hard to discern influences being involved with the Lot (ie with chronic conditions of ill health affecting the subject)
-Saturn (and I do also accept the Moon/Saturn position in the chart as also indicative of potential health problems) has been transiting Scorpio for some time-with Lots, the entire sign "contains" the Lot (not only the exact degree of the Lot), so relative to activation of this Lot we find this Lot being activated (activation of chronic illness condition) by Saturn's current transit (since Saturn in the natal is also a contributory factor to the native's health problem due to the Moon/Saturn situation in the natal)*
(*can such a Saturn transit activate a condition of ill health? In my chart, Saturn is a potent planet, both for good and for ill; without going into details at this time, let me mention that Saturn in Scorpio FOR ME-that is, in my own chart-is indicated as a most - transit: during this same Saturn transit of Scorpio, I received an injury to my right foot, which later became septic and which required amputation of the foot at the ankle {June 25, 2014} While I'll be getting a prosthetic foot over the next couple of months which will allow pretty normal walking, nonetheless I consider the loss of my right foot as connected with the Saturn transit of Scorpio, due to the confluence of indications regarding Saturn and Scorpio in my own specific chart...So, YES, I believe that certain transits of Saturn CAN influence serious affections of health under the right confluence of susceptibilities as shown in a given natal chart, and I believe that the current Saturn transit of Scorpio has a special affinity for the OP due to the OP's natal Lot of Chronic Illness being in Scorpio, and in the OP's natal first house)