根據研究顯示那些患有偏頭疼得人們幾乎同樣都顯示出靜脈里有血塊的癥狀
在靜脈血栓癥或血栓栓賽的情況下，靜脈中形成的血塊會限制血液流動造成身體腫脹及疼痛。這些血塊會隨血液從靜脈中流出，并移動到心臟和肺部這對病人來說將是致命的。
在意大利進行的一項研究，對574名55歲以上的人進行了采訪以確定他們是否有偏頭疼的病史和患病時的評估，以及他們關于靜脈血栓癥的醫療記錄。通過超生掃描在他們頸部和大腿的靜脈以檢查是否有動脈粥樣硬化，或者動脈硬化。
在參與者中共有111人占總數19%的參與者有偏頭疼。其中21名患有偏頭疼的參與者有一或二例靜脈血栓癥。相比之下，35名占總數8%的參與者沒有偏頭疼也有這樣的癥狀。研究者不清楚為什么偏頭疼和靜脈血栓癥之間會有聯系。一種理論就是人們靜脈中的血液也許更容易凝塊。
這項研究同樣發現患有偏頭疼的人更容易發生動脈硬化和窄化，這和當前的理論正好相反“這種想法是因為患偏頭疼人們更容易中風和發生其他心血管疾病，他們回有更嚴重的早期動脈粥樣硬化” 這個研究的發起人，奧地利因斯布魯克醫科大學的Stefan Kiechl 博士談到：“這個研究是第一個運用高分辨率超生波去檢查這個理論，并且提出了可靠的證據去反駁它。”

Veins: Migraine Linked to Blood Clots
People with migraines may also be more likely to develop blood clots in their veins, according to a study.
In the condition, called venous thrombosis or thromboembolism, blood clots form in a vein, which can limit blood flow and cause swelling and pain. Those clots can then dislodge from the vein and travel to the heart and the lungs, which can be fatal.

For the study, 574 people in Italy age 55 and up were interviewed to determine whether they had a history of migraine or migraine at the time of the evaluation and their medical records were reviewed for cases of venous thrombosis. The arteries in their necks and thighs were scanned with ultrasounds to check for atherosclerosis, or hardening of the arteries.

Of the participants, 111 people had migraine. A total of 21 people with migraine also had one or more instances of venous thrombosis, or 19 percent. In comparison, 35 people without migraine had the condition, or 8 percent. Researchers do not know why migraine and venous thrombosis are linked. One theory is that the blood of people with migraine may be more prone to clotting.

The study also found that people with migraine are not more likely to have hardening or narrowing of the arteries, which is contrary to a current theory. “The thinking has been that because people with migraine are more likely to have strokes and other cardiovascular problems, that they would also have more severe and early atherosclerosis,” said study author Stefan Kiechl, MD, of Innsbruck Medical University in Austria. “This study is the first to use high-resolution ultrasound to examine this theory, and it provides solid evidence to refute it.”