Study: Are Hypermobility Syndrome and Asthma Related?

Yes, conclude researchers:
We have demonstrated, for the first time, that individuals with HMS/BJHS and EDS have respiratory symptoms in association with various pulmonary physiological abnormalities. The increased prevalence of asthma may be due to linkage disequilibrium between the genes causing these conditions or a function of the connective tissue defect itself. In the non‐asthmatic population, changes in the mechanical properties of the bronchial airways and lung parenchyma may underlie the observed increased tendency of the airways to collapse.

 Details of the paper:

Asthma and airways collapse in two heritable disorders of connective tissue

A W Morgan, S B Pearson, S Davies, H C Gooi, and H A Bird

Ann Rheum Dis. 2007 Oct; 66(10): 1369–1373.
doi:  10.1136/ard.2006.062224